|Publication number||US3922730 A|
|Publication date||Dec 2, 1975|
|Filing date||Mar 11, 1974|
|Priority date||Mar 11, 1974|
|Publication number||US 3922730 A, US 3922730A, US-A-3922730, US3922730 A, US3922730A|
|Inventors||James M Kemper|
|Original Assignee||Monogram Ind Inc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (65), Classifications (10), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent [1 1 [111 3,922,730 Kemper Dec. 2, 1975 RECIRCULATING TOILET SYSTEM FOR 3,43l,563 3/1969 USE IN AIRCRAFT OR THE LIKE  Inventor: James M. Kemper, Sherman Oaks, 33 35347 9/1974 Calif.  Assignee: Monogram Industries, Inc., Santa i a g 'f g k Monica, Calif sszstant xammer uar evy Attorney, Agent, or FirmPoms, Smith, Lande &  Filed: Mar. 11, 1974 Glenny  Appl. No.: 449,619
 ABSTRACT  U S Cl 4/10 4/77 4/79, A recirculating toilet system for use in an aircraft or 2l0/167 the like having at least one toilet with a valve.  Int. Cm /016 controlled drain line and a waste tank connected to  Field of 12 17 76 the drain line having a flushing fluid therein. A valve- 4/79 89 90 6 S controlled flushing line is in fluid communication with 2 6 both the tank and the toilet and at least one pump is provided for pumping the flushing fluid from the tank  References Cited to.the t0ilet.-Means are provided for forming a vac- UNITED STATES PATENTS uum in the tank so that when the toilet is flushed,
waste products are sucked into the tank while the toi- 2,749,558 6/1956 Lent et al. 4/10 let is fl h d with the flu hi fl id 3,032,776 5/1962 Obert ct al.... 4/131 X 3,079,612 3/196-3 Corliss 1. 4/10 11 Clalms, 3 Drawms Flgures 33 Floor Line Signal L 5/ J Pu el 39 I 36 l 40 5o 5| I 57 I 53 x& 34 53 P 52' 47 I 27 I2 US. Patent Dec. 2, 1975 Sheet 1 of 2 3,922,730
RECIRCULATING TOILET SYSTEM FOR USE IN AIRCRAFT OR THE LIKE BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a recirculating toilet system; and, more particularly, to a recirculating toilet system for use in an aircraft or the like.
2. Description of the Prior Art Self-contained, recirculating toilet systems are currently being used on large aircrafts. Such systems generally comprise a plurality of substantially independent, recirculating toilet systems, each with its own filter and pump assembly and storage tank.
Such prior art systems have varying disadvantages, a discussion of which is presented in application Ser. No. 243,897, entitled MULTIPLE RECIRCULATING TOILET, filed by James M. Kemper on Apr. 13, 1972, and commonly assigned to Monogram Industries.
It is noted, however, that none of these prior art systems take advantage of the differential pressure created across the cabin of all recent commercial aircraft. Further, the piping from the toilets to the sewage tank in such prior art systems are relatively high in inside diameter in order to permit the sewage from the toilets to flow by gravity to the sewage tank. This results in a considerable cost and weight problem. Finally, odors are present in these prior art systems and the technology heretofore in this art did not remove all of the objectionable odors from the lavatories in which the toilets are installed.
SUMMARY OF THE INVENTION It is an object of this invention to. provide an improved recirculating toilet system for use in an aircraft or the like.
It is a further object of this invention to provide such a recirculating toilet system which removes substantially all objectionable odors from the lavatory in which the toilets of such system are installed.
It is still another object of this invention to provide a recirculating toilet system for use on an aircraft which removes human waste products from the toilets of such system without the use of gravity.
These and other objects are preferably accomplished by providing a recirculating toilet system having at least one toilet with a valve-controlled drain line and a waste tank connected to the drain line having a flushing fluid therein. A valve-controlled flushing line is in fluid communication with both the tank and the toilet and at least one pump is provided for pumping the flushing fluid from the tank to the toilet. Means are provided for forming a vacuum in the tank so that, when the toilet is flushed, waste products are sucked into the tank while the toilet is flushed with the flushing fluid.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a vertical, partly diagrammatic, view of a recirculating toilet system in accordance with the teach ings of my invention;
FIG. 2 is a view ofa portion of FIG. 1 showing a modification thereof; and
FIG. 3 is a block diagram, partly schematic, of the control system for the toilet system of FIG. 1.
DESCRIPTION OF THE PRIOR ART Referring now to the drawing, a recirculating system 10 in accordance with the teachings of my invention is shown. This system 10 is particularly designed to be used in an aircraft or the like and thus a portion of the skin or body shell 11 of an airplane is shown. A plurality of substantially identical pumps 12 through 14 (three being shown), are shown as connected in parallel to a single flush manifold 15 which serves several, substantially identical toilet assemblies 16 through 20 (five being shown).
A push-button switch 21 is provided for each of the toilet assemblies 16 through 20, which controls a flush valve 22 operatively engaging the flush manifold 15 to initiate a flushing cycle. A waste return line 23 couples each toilet assembly 16 through 20 to a waste manifold 24 leading to a single holding tank 25.
Pumps 12 through 14 are commonly connected to a pressure sensing line 26, of a smaller internal diameter than flush manifold 15, which is adequate to signal pressure in the line 26 associated with the motor of each pump 12 through 14, respectively. Each of the toilet assemblies 16 through 20 is coupled to flush manifold 15 through the solenoid flush valve 22 which may beoperated by an electrical control assembly 31 which will be discussed further hereinbelow. A pressure switch 32 in pressure sensing line 26 applies an electrical signal output to the control assembly 31.
Pumps 12 through 14 may be any suitable pumps, such as pumps having a pumping capacity of twenty gallons per minute and as disclosed in my aforementioned copending application Ser. No. 243,897. Thus, as disclosed in that application, in the event of failure of any of the pumps 12 through 14, a failure warning indicator panel 33 may be provided at a remote location and operatively connected to control assembly 31 so that repair crews may be alerted to repair or replace the failed pump. Conventional one-way check valves 27 through 29 may be associated with each pump 12 through 14.
As particularly contemplated within the present invention, waste removal means are provided for removing waste from toilet assemblies 16 through 20. In the exemplary embodiment, such waste removal means, indicated generally at 34, includes the inner pressurized area 35 of the aircraft itself which may be referred to as the cabin of the aircraft. Thus, all present day commercial aircraft ordinarily fly at about 12,000 feet or more and have a pressurized cabin which is higher in pressure than the pressure outside of the aircraft. Thus, the cabin may be kept at a sea level pressure, such as 18 inches of mercury. A vacuum regulator may be used to automatically create a vacuum within tank 25. That is, in addition to area 35, waste removal means 34 includes a vacuum line 36 extending to an opening 37 formed in the shell 11 of the aircraft and in communication with an opening 38 at generally the top of holding tank 25. A vacuum regulator 39 is operatively disposed in line 36 between openings 37 and 38 to maintain the interior 44 of tank 25 under vacuum.
It can be seen that waste manifold 24 is in fluid communication with both waste return lines 23 from t'oilet assemblies 16 through 20 and a holding tank line 40 leading into holding tank 25 at substantially the upper end thereof.
It can also be seen that a solenoid drain valve 30 is operatively connected to a diaphragm actuated flapper seal 41 adapted to selectively open and close the discharge portion 42 of the bowl 43 of each toilet assembly 16 through 20.
In this manner, the interior 44 of holding tank 25 is kept under vacuum. A drain or pumpout line 45 may be in fluid communication with a portion of holding tank 25 substantially above the lowermost end thereof along line 47 but below generally the midpoint thereof. This pumpout line 45 extends to a port 46 in shell 11 so that waste solids may be removed, when desired, from the interior 44 of tank 25.
The interior 44 of tank 25 may also be diagonally divided by a screen 48, which may be of stainless steel, and have a mesh sufficient to prevent the passage therethrough of undesirable foreign matter, such as metal particles or the like, from assemblies 16 through 20 so as to prevent damage to pumps 12 through 14. It can be seen in FIG. 1 that the interior 44 of tank 25 includes a bottom section 49 below line 47. As particularly contemplated within the present invention, means are provided for killing any bacteria in the fluid returned from tank 25 and maintaining this fluid clear. In the exemplary embodiment, such means, indicated generally at 50, includes an injector 51 adapted to contain therein a predetermined quantity of chlorine 52 adapted to kill bacteria in the mixture of liquid waste and flushing fluid before the bacteria has a chance to be absorbed by the flushing fluid. This keeps the flushing fluid clear when it settles in the bottom of tank 25. Thus, injector 51 may include an injection line 53 opening into the fluid in tank 25 disposed above line 47. A suitable valve 53' controlled by a solenoid 52, may be provided in line 53 for controlling the injection of chlorine from injector 51 into tank 25. Solenoid 52 may be operatively connected to control assembly 31 and controlled therefrom to release a predetermined amount, such as 30 ml, each time a toilet assembly is flushed as will be further discussed hereinbelow. A vent 50 may be provided in injector 51. A drain line 54 extends from fluid communication with the lowermost portion of the bottom section 49 of tank 25 and to a pump manifold 55 in fluid communication with pumps 12 through 14.
A surge tank 56 which is always kept under pressure by means of pumps 12 through 14 is disposed in system in fluid communication with both pressure sensing line 26 and a flush line 57 leading to manifold 15. This tank 56 may have a capacity of about 3 gallons if each pump 12 through 14 is of a gallons per minute capacity. The outlets or discharge portions 42 of bowls 43 are mounted within the floor 58 of the aircraft.
In operation, it can be seen that system 10 is designed to take advantage of the differential pressure across the cabin of the aircraft in which it is installed. The pressure within area 35 of the aircraft is greater than the pressure outside of the aircraft. The sewage or holding tank is thus exposed to the atmosphere outside of the aircraft by means of vacuum line 36, regulator 39 regulating the vacuum formed in the interior 44 of tank 25 as discussed hereinabove.
In a normal prior art waste disposal system, the waste products from bowls 43 must flow by gravity to tank 25. In this system 10, as each flush valve is activated to open its respective seal 41, the combination of the pressure in the aircraft cabin and the vacuum in the tank 25 results in a tremendous suction taking place, which draws the waste products within bowl 43 through discharge portion 43, into manifold 24 and then into holding tank 25. This tremendous suction also sucks and thereby removes all undesirable odors in the lavatory in which toilet assemblies 16 through 20 are installed.
Since suction rather than gravity is used to empty bowls 43, the piping from bowls 43 to tank 25 may be significantly less in internal diameter than known prior art piping, as for example, piping having an internal diameter of about 1 /2 inches compared to prior art piping having an internal diameter of about 4 inches. This results in considerable cost and weight savings. Also, when flush valves 30 close seals 41, since tank 25 is in communication with the outside of the aircraft, no undesirable odors can enter the lavatory wherein assemblies 16 through 20 are installed.
Tank 25 is initially charged with a suitable flushing fluid that is not soluble in waste products, in this embodiment of the invention, a flushing fluid having a specific gravity at 20 C. higher than the specific gravity of the waste products, i.e. higher than 1.0. Thus, as shown in FIG. 1, bottom section 49 of tank 25 holds the flushing fluid therein and this fluid covers substantially the bottom of tank 25 to a preferable depth of about four inches.
Also, as shown, screen 48 filters out foreign matter onto one side of the interior 44 of tank 25 and the waste products (e.g., urine, human waste solids, and the flushing fluid) on the other. The mixture of solids, urine and flushing fluid settles so that the flushing fluid is below the urine due to its higher specific gravity. Of course, port 46 permits tank 25 to be cleaned out when desired.
Thus, when a flush cycle is to be initiated at a toilet assembly, the appropriate push button switch 21 is activated signalling the control assembly 31. As discussed in my co-pending application Ser. No. 243,897, one of the pumps 12 through 14 is then selected and power is applied to its motor. If operable, the selected pump will begin pumping. The fluid is pumped into line 26 and enters surge tank 56 which feeds fluid therefrom through flush line 57 leading to flush manifold 15. The fluid pressure in manifold 15 will rise. The solenoid flush valve 22 corresponding to the selected push button switch 21 is also energized to open.
Thus, as the fluid pressure line 26, flush manifold 15 and flush line 57 increases, pressure switch 32 is operated signalling to control assembly 31 that the pressure has reached a predetermined minimum. The fluid is then applied to the appropriate toilet assembly 16 through 20 through the open flush valve 22 and into a flushing pipe or line 59 opening into the top of each bowl 43 to thereby flush the interior of the bowl.
The pressure sensing switch 32 operates the motor in the selected pump to maintain the pressure in the flush manifold 15 below a preselected maximum.
Control assembly 31 may include a timing circuit therein to be discussed further hereinbelow to maintain the flush valve 22 open for a timed flushing interval. At the expiration of that interval, the flush valve 22 is closed and the pump motor of the selected pump is de-energized. The operation of the various pumps if one or more fails to operate or if a second button switch 21 is activated is described in detail in my co-pending application Ser. No. 243,897, the pertinent subject matter therein being incorporated herein by reference.
Drain valves 30 are operatively connected to flushing line 59 and are opened upon the opening of flush valve 22 to thereby open flapper seals 41. Since the interior 44 of tank 25 is under vacuum as heretofore described, the waste products within bowls 43 are immediately sucked into tank 25 to again initiate the discharge portion of system 10.
Although a flushing fluid having a specific gravity greater than 1.0 has been disclosed, water, which has a specific gravity of 1.0, may be used as the flushing medium. This is shown in FIG. 2 wherein like numerals refer to like parts of FIG. 1. Thus, tank 60 is identical to tank 25 except that a screen 61 may be disposed in bottom section 49 and above the inlet of drain line 54 to screen the solids out of the mixture of urine, water and solids.
If water is used as the flushing fluid, a predetermined amount of chlorine is preferably injected along with the water since water will absorb bacteria and oil will not.
That is if an oil is used as the heavier than water flushing fluid, it is well known that bacteria will not grow in oil. If water is used as the flushing fluid, chlorine is injected along with the water to kill any bacteria therein. The filtering medium will remove any solid material and thus purify the urine in the urine-water mixture.
A control circuit for operating system of FIGS. 1 and 2 is shown schematically in FIG. 3. FIG. 3 has been generalized to cover a system having N toilet assemblies and M pumps. This is indicated by applying to the reference numerals of the several switches 21 a subscript 1 through n. Similarly, the flush valves 22 are also suitably subscripted 1 through n.
Connected to each push button 21, is a relatively long, interval timer circuit 140. The long timer circuit 140 is intended to be energized for a predetermined, adjustable time interval and provides a continous output during the timed interval. One output of the timer circuit 140 is applied to energize the flush valve 22 and a second output is applied through an or circuit 142, which applies its output to a counter 144 and to a second, relatively short, interval timer 146.
The or circuit 142 receives substantially similar inputs from each of the long interval timers 140 and provides a single output to the remaining elements of the control circuit 31.
The counter 144 may be a ring counter or any other conventional, addressing circuit which sequentially selects, in turn, M different output lines, all of which are applied to a selection logic circuit 148 which ultimately determines which of the M pumps 12, 13, 14 and 12m to energize.
The output of the short interval timer 146 is applied on a first line through a normally closed set of switch contacts 132a to the selection logic circuit 148, and, on a second line through a second set of normally closed switch contacts 132b, to a medium interval timer 150. The output of the medium interval timer is also applied to the selection logic block 148.
The normally closed switch contacts 132a and 132b are directly controlled by the pressure switch 32 which, in this embodiment, is arranged to maintain switches 132a and 13212 in the closed configuration so long as the pressure detected is less than a preset magnitude. When the prssure exceeds the limit, the two switches 132a and 13212 are opened, interrupting both circuits to the selection logic circuit 148.
As is well known in the design and construction of data processing equipment, the operation of the control circuit 31 may be represented by a series of logical equations which define the conditions under which an output is provided. Once these equations have been formulated, it is then routine to design the appropriate structural elements that operate in accordance with these logical equations.
In operation, it will be seen that as a push button 21 is actuated, the relatively long timer is energized, which times the flush cycle. A counting impulse is applied to the counter 144 to select one of the pumps. The selection is signalled on the appropriate output line to the selection logic block 148, which immediately energizes the selected pump, injects chlorine from injector 51 into tank 25, and removes flushing fluid from tank 25 and pumps it through reservoir 56.
The relatively short interval timer 146 is energized for an interval which is believed adequate to permit the selected pump to come to full pressure in the line. The pressure switch 32 switch contacts 132a and 1321; will be opened by the pressure increase and at the time that a signal output is provided by the short interval timer 146, the circuit will be open.
If the pressure in the line is not adequate to open switch contacts 132a, 132b, then a signal is applied by the timer 140 to the selection logic 148 and to the medium length timer 150. The selection logic 148 then energizes a second motor. If the pressure in the line is still insufficient to open the switch contacts 132a, 132b, then the output of the medium interval timer 150, when applied to the selection logic 148, energizes the third motor of the group through the circuitry of the selection logic 148.
During a flush cycle, if the pressure drops sufficiently to reclose the switch contacts 132a, 132b, a second pump is immediately energized, and if pressure is not restored within the interval timed by the second timer 150, a third pump is energized.
It is not believed essential to describe the detailed logic required to select the appropriate failure warning lights in panel 33. It will be obvious to those skilled in the art that the circumstances dictating the lighting of the failure lamps can be easily expressed in logical terms which can be simply mechanized.
The successive energization of more than one push button 21 will not affect the state of the counter 144 so long as a pump is running. However, as soon as the latest flush cycle is concluded, and the pumps deenergized, the next energization of a push button 21 will advance the counter 144.
It can be seen that I have described a recirculating toilet system which is particularlay suited to take advantage of the pressurized cabin of an aircraft or the like. This system removes all odors from the lavatory in which the toilets of the system are installed when flush ing such toilets with a flushing fluid.
I claim as my invention 1. A recirculating toilet system for use in a pressurized cabin of an aircraft or the like comprising:
at least one toilet assembly disposed in said cabin having a valve-controlled drain line;
a waste tank under vacuum operatively connected to said drain line having a pressure in its interior at a lesser pressure than the exterior pressure at the toilet assembly;
vacuum controlling means associated with said tank for controlling the vacuum within the interior of the tank;
a valve-controlled flushing line communicating with both the interior of said tank and said toilet assembly; and v at least one pump disposed in said flushing line having an inlet in fluid communication with the interior of said tank and an outlet in fluid communication with said toilet assembly.
2. The system of claim 1 wherein a pressurized surge tank having a portion of a flushing fluid therein is in selective fluid communication with the outlet of said pump.
3. The system of claim 2 including pressure response means associated with said pump and said surge tank adapted to respond to fluid pressure in said system to maintain a predetermined pressure at said toilet assembly.
4. The system of claim 1 wherein a plurality of toilet assemblies and pumps are provided, each of said pumps being controllable volume pumps and means associated with each of said pumps adapted to respond to fluid pressure in the system to maintain a predetermined system pressure, said pumps being connected to parallel to supply fluid to the toilet system, fluid pressure sensing means connected to the toilet system for providing a first signal when sensed fluid pressure is less than a predetermined magnitude;
control means, connected to said pumps and said pressure sensing means, operable in response to applied first signals for energizing one of said pumps for increasing the flow of fluid into the toilet system;
a switch at each of the toilet assemblies connected to said control means, said control means being responsive to switch actuations for energizing one of said pumps, said control means being further operable in response to said first signals for energizing the other of said pumps.
5. In the system of claim 1 wherein a flushing fluid having a specific gravity greater than the specific gravity of water is disposed in said waste tank.
6. In the system of claim 1 wherein a predetermined amount of flushing fluid having a specific gravity lesser than the specific gravity of water is disposed in said waste tank.
7. In the system of claim 1 wherein said waste tank communicates with the exterior of said aircraft and said vacuum controlling means is associated with the communication between said waste tank and the exterior of said aircraft.
8. A method for flushing a toilet in a pressurized aircraft or the like wherein said toilet is installed in the interior of said aircraft and includes a valve-controlled drain line, a waste tank in fluid communication with the drain line, a valve-controlled flushing line communicating with both the interior of said tank and said toilet and at least one pump disposed in said flushing line having an inlet in fluid communication with the interior of said tank and an outlet in fluid communication with said toilet, the method which comprises the step of:
communicating the interior of said tank with the atmosphere outside of said aircraft; controlling the communication between the interior of said tank and the exterior of said aircraft to create a vacuum within said tank at a pressure lesser than the exterior pressure at said aircraft;
activating the valve of said flushing line to flush said toilet with a flushing fluid; and
sucking any waste products and flushing fluid in said toilet out of said toilet and into said tank due to the differential pressure between the exterior of said toilet and the interior of said tank thereby also removing any undesirable odors in the portion of said aircraft where said toilet is installed.
9. The method of claim 8 further including the step of maintaining a predetermined fluid pressure within said flushing line.
10. In the system of claim 8 including the step of initially placing a predetermined amount of flushing fluid having a specific gravity greater than the specific gravity of water in said waste tank.
11. In the system of claim 8 including the step of initially placing a predetermined amount of flushing fluid having a specific gravity lesser than the specific gravity of water in said waste tank.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2749558 *||Dec 11, 1951||Jun 12, 1956||Mehler Alan||Defecation relief unit for aeroplane personnel and sick-bed|
|US3032776 *||Apr 18, 1958||May 8, 1962||Edward F Obert||Waste disposal method and means|
|US3079612 *||Jul 6, 1959||Mar 5, 1963||Monogram Prec Ind Inc||Sewage handling apparatus|
|US3431563 *||Dec 22, 1966||Mar 11, 1969||Anthony Rascov||Toilet utilizing oil as a flushing agent|
|US3673614 *||Dec 21, 1970||Jul 4, 1972||Chrysler Corp||Sewage disposal system with reusable flush medium|
|US3829909 *||Mar 5, 1973||Aug 20, 1974||Monogram Ind Inc||Recirculating toilet|
|US3835478 *||Jun 8, 1972||Sep 17, 1974||Monogram Ind Inc||Multiple recirculating toilet|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3995328 *||Dec 13, 1974||Dec 7, 1976||The Boeing Company||Vacuum toilet system|
|US4013557 *||Jun 6, 1975||Mar 22, 1977||Sloan Valve Company||Sewage treatment apparatus|
|US4028747 *||Mar 26, 1976||Jun 14, 1977||Monogram Industries, Inc.||Oil toilet|
|US4052758 *||Sep 12, 1975||Oct 11, 1977||Frank Arena||Human waste disposal system|
|US4063315 *||Aug 16, 1976||Dec 20, 1977||The Boeing Company||Vacuum toilet system|
|US4083067 *||Jan 29, 1976||Apr 11, 1978||Diamond Shamrock Corporation||Recirculating toilet and method|
|US4107798 *||Jul 18, 1977||Aug 22, 1978||Koehler-Dayton, Inc.||Self-contained toilet|
|US4115876 *||Nov 24, 1976||Sep 26, 1978||Cole Resdevel Corp.||Self-contained recirculating toilet system|
|US4202061 *||Dec 29, 1978||May 13, 1980||The Boeing Company||Lavatory wastewater disposal system for aircraft|
|US4222130 *||Jan 29, 1979||Sep 16, 1980||Inca-One Corporation||Waterless flush toilet system|
|US4275470 *||Aug 20, 1979||Jun 30, 1981||Rogerson Aircraft Controls||Vacuum-flush toilet arrangement for aircraft|
|US4313233 *||Jun 20, 1980||Feb 2, 1982||Inca-One Corporation||Waterless flush toilet system|
|US4332041 *||Nov 24, 1980||Jun 1, 1982||The Boeing Company||Pressurized drain for toilet waste tank|
|US4357719 *||Feb 26, 1981||Nov 9, 1982||Rogerson Aircraft Controls||Non recirculating method of disposing of waste products for aircrafts|
|US4376315 *||Jun 29, 1981||Mar 15, 1983||Rogerson Aircraft Controls||Vacuum flush valve|
|US4527295 *||Jun 1, 1984||Jul 9, 1985||Lacore Brian C||Tank flushing apparatus|
|US4546502 *||Oct 9, 1984||Oct 15, 1985||Lew Hyok S||Evaporative waste disposal system|
|US4547917 *||May 3, 1984||Oct 22, 1985||Torsten Akesson||Water closet system having a liquid separator|
|US4550738 *||Mar 26, 1984||Nov 5, 1985||Estey Herman C||Sanitary ashtray system|
|US4791688 *||Aug 7, 1987||Dec 20, 1988||Chamberlain Manufacturing Corporation||Jet pump macerator pump sewage handling system|
|US4914758 *||Jun 27, 1988||Apr 10, 1990||Bauer Industries Inc.||Fresh water control system and method|
|US4918764 *||Jun 13, 1988||Apr 24, 1990||Microphor, Inc.||Electrically operated toilet|
|US4955091 *||Aug 12, 1988||Sep 11, 1990||Kaiser Aerospace And Electronics Corporation||Method and apparatus for a vacuum assisted toilet system|
|US5007117 *||Dec 21, 1988||Apr 16, 1991||Oy Wartsila Ab||Vacuum toilet system with simultaneous rinse and discharge|
|US5026407 *||Sep 6, 1990||Jun 25, 1991||The Boeing Company||External separator for vacuum waste system|
|US5035011 *||Jun 5, 1990||Jul 30, 1991||Mag Aerospace Industries, Inc.||Self draining sanitation system|
|US5080797 *||Oct 26, 1990||Jan 14, 1992||Telefunken Systemtechnik Gmbh||Method of disposing of fecal matter from toilet systems in fast moving vehicles|
|US5084920 *||Jan 19, 1990||Feb 4, 1992||Kimball James L||Water recycling system|
|US5175892 *||Apr 10, 1990||Jan 5, 1993||Bauer Industries, Inc.||Fresh water control system and method|
|US5234483 *||Jul 22, 1991||Aug 10, 1993||Dominique Tertre||Negative pressure sanitary installation equipped with a purifier of gaseous fluids|
|US5372710 *||Mar 14, 1994||Dec 13, 1994||Deutsche Aerospace Airbus Gmbh||System for producing reduced pressure on board of an aircraft|
|US5418982 *||Oct 26, 1993||May 30, 1995||Japanic Corporation||Raw sewage disposal apparatus and prefab for accommodating the same|
|US5419347 *||Oct 27, 1993||May 30, 1995||Ssi Medical Services, Inc.||Automated flushing module|
|US5447630 *||Apr 28, 1993||Sep 5, 1995||Rummler; John M.||Materials treatment process and apparatus|
|US5702536 *||Mar 7, 1996||Dec 30, 1997||Hill Rom Company, Inc.||Method of cleaning a patient support device for care, maintenance, and treatment of the patient|
|US5711038 *||Mar 7, 1994||Jan 27, 1998||Niethammer Gmbh||Toilet system|
|US5725762 *||May 22, 1995||Mar 10, 1998||Wastech International, Inc.||Separation treatment system|
|US5843304 *||May 22, 1995||Dec 1, 1998||Wastech International, Inc.||Filtration and treatment system|
|US5853579 *||Nov 26, 1996||Dec 29, 1998||Wastech International Inc.||Treatment system|
|US5975111 *||Sep 29, 1997||Nov 2, 1999||The Boeing Company||Waste tank clog removal system|
|US6347416||Nov 16, 2000||Feb 19, 2002||Evac International Oy||Vacuum toilet bowl assembly having a removable bowl|
|US6349424||Nov 16, 2000||Feb 26, 2002||Evac International Oy||Rinse fluid valve for a vacuum toilet|
|US6349425||Nov 16, 2000||Feb 26, 2002||Evac International Oy||Valve set for a vacuum toilet|
|US6353942||Nov 16, 2000||Mar 12, 2002||Evac International Oy||Modular vacuum toilet with line replaceable units|
|US6370709||Nov 16, 2000||Apr 16, 2002||Evac International Oy||Discharge valve having a disk with a flushing aperture and an air intake aperture for a vacuum toilet|
|US6453481||Mar 20, 2001||Sep 24, 2002||Evac International Oy||Vacuum waste system having a vacuum control valve|
|US6536054||Jan 22, 2002||Mar 25, 2003||Evac International Oy||Vacuum toilet bowl assembly having removable bowl|
|US6536055||Feb 1, 2002||Mar 25, 2003||Evac International Oy||Modular vacuum toilet with line replaceable units|
|US6704947||Feb 1, 2002||Mar 16, 2004||Evac International Oy||Discharge valve for a vacuum toilet|
|US6732386||Jan 29, 2002||May 11, 2004||Evac International Oy||Rinse fluid valve for a vacuum toilet|
|US6776183||Apr 23, 2003||Aug 17, 2004||Goodrich Corporation||Aircraft drain device|
|US7005077 *||Apr 15, 2005||Feb 28, 2006||Brenner Samuel L||Shipboard human waste treatment for removing solids|
|US7178796||Nov 29, 2004||Feb 20, 2007||Freudenberg-Nok General Partnership||Rate stiffening jounce bumper assembly|
|US8377291 *||Oct 20, 2011||Feb 19, 2013||Eckman Environmental Corporation||Graywater systems|
|US20030177569 *||Jan 29, 2002||Sep 25, 2003||Anderson William Bruce||Rinse fluid valve for a vacuum toilet|
|US20040148690 *||May 23, 2002||Aug 5, 2004||Freeman Mark J||Toliet system|
|US20040168992 *||Dec 15, 2003||Sep 2, 2004||Ori Ben-Amotz||Device, system and method for gray water recycling|
|US20080257806 *||Sep 11, 2006||Oct 23, 2008||Silvano Rossato||Method and Apparatus for Treating Wastes, Particularly of a Biological and Domestic Origin|
|US20100116935 *||Apr 17, 2008||May 13, 2010||Airbus Operations Gmbh||Vacuum toilet system for waste water transport and waste water collection in an aircraft|
|US20120037234 *||Oct 20, 2011||Feb 16, 2012||Eckman Environmental Corporation||Grey water recycling apparatus and methods|
|DE3717705A1 *||May 26, 1987||Dec 10, 1987||Dixi Sanitaersystem Gmbh & Co||Sanitary facility and wheeled toilet|
|EP0598643A2 *||Nov 8, 1993||May 25, 1994||Hill-Rom Company, Inc.||Method and apparatus for cleaning and disinfecting the conduits and chambers of patient service devices|
|EP0598643A3 *||Nov 8, 1993||Jun 15, 1994||Ssi Medical Services Inc||Method and apparatus for cleaning and disinfecting the conduits and chambers of patient service devices.|
|WO1991018789A1 *||May 31, 1991||Dec 12, 1991||Mag Aerospace Industries, Inc.||Drain valve|
|WO1994010397A1 *||Oct 28, 1993||May 11, 1994||Burton Mechanical Contractors, Inc.||Vacuum toilet system and discharge valve thereof|
|U.S. Classification||4/316, 4/DIG.110, 4/318, 210/167.1, 4/342, 4/317|
|Cooperative Classification||Y10S4/11, E03D5/016|
|Dec 6, 1996||AS||Assignment|
Owner name: MAG AEROSPACE INDUSTRIES, INC., CALIFORNIA
Free format text: RELEASE AND REASSIGNMENT OF SECURITY INTEREST;ASSIGNOR:HELLER FINANCIAL, INC.;REEL/FRAME:008354/0071
Effective date: 19961202
|Jul 15, 1992||AS||Assignment|
Owner name: HELLER FINANCIAL, INC.
Free format text: SECURITY INTEREST;ASSIGNOR:MAG AEROSPACE INDUSTRIES, INC., A CORP. OF DE;REEL/FRAME:006198/0529
Effective date: 19920626
|Aug 8, 1989||AS||Assignment|
Owner name: MAG AEROSPACE INDUSTRIES, INC., C/O VESTAR CAPITAL
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MONOGRAM INDUSTRIES, INC.;REEL/FRAME:005152/0265
Effective date: 19890718