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Publication numberUS3856932 A
Publication typeGrant
Publication dateDec 24, 1974
Filing dateDec 16, 1969
Priority dateDec 16, 1969
Publication numberUS 3856932 A, US 3856932A, US-A-3856932, US3856932 A, US3856932A
InventorsMay M
Original AssigneeMay M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Tablet of a chlorine releasing solid compound
US 3856932 A
Abstract
A tablet of chlorine releasing solid compound having substantially parallel plane faces in which the surfaces of the edge between the faces is sealed by water impervious and water insoluble material, which may be a continuous band of insoluble material which adheres to the compound, may be a band comprising a flexible sheet material attached to the edges of the tablet by a water insoluble adhesive, at least one of which is water impervious, or may have one of a number of alternative constructions comprising a self-adhesive tape, a coating of paint or synthetic resin, or a coating of wax. Alternatively the continuous band may be the side of a cup-like member and the tablet is sealed within the cup-like member by water impervious insoluble sealing material.
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Description  (OCR text may contain errors)

[ 1 Dec. 24, 1974 TABLET OF A CHLORINE RELEASING SOLID COMPOUND Michael Axton May, West Hanningfield, Gay Bower Farm, England 22 Filed: Dec. 16, 1969 211 Appl. No.: 885,494

[76] Inventor:

[52] US. Cl 424/16, 21/58, 206/84, 210/62, 210/64, 252/90, 252/93, 252/94,

252/187, 424/32, 424/34, 424/38, 424/149, 424/249 [51] Int. CL... B65d 81/00, C02b 3/08, A0ln 11/00 [58] Field of Search 424/16, 149, 249; 252/90-94,'l34, 174-176, 187; 210/62, 64;

[56] References Cited UNITED STATES PATENTS 262,745 8/1882 Crump' 252/93 395,243 12/1888 Maggi 206/56 X 740,440 10/1903 Jones 252/93 805,560 11/1905 Kohn A 206/.5 X

1,144,186 6/1915 Freestone 252/93 1,325,361 12/1919 Harshberger 252/93 1,335,488 3/1920 Davis 424/10 1,393,253 10/1921 Thompson 424/6 1,413,064 4/1922 Salflsberg 206/56 X 1,782,526 11/1930 Beardsley 206/56 X 2,051,665 8/1936 West 215/9 X 2,312,381 3/1943 Bickenheuser.... 424/44 2,341,583 2/1944 Tuve 40/134 2,517,513 8/1950 Vaernet 128/272 2,519,045 8/1950 Houghton. 424/15 3,113,076 12/1963 Jacobs 424/16 X 3,279,995 10/1966 Reid 424/15 3,342,674 9/1967 Kowalski 424/14 3,488,420 1/1970 Keast et a1. 424/128 Primary Examiner-Shep K. Rose Attorney, Agent, or Firmirving M. Weiner [57] ABSTRACT A tablet of chlorine releasing solid compound having substantially parallel plane faces in which the surfaces of the edge between the faces is sealed by water impervious and water insoluble material, which may be a continuous band of insoluble material which adheres to the compound, may be a band comprising a flexible sheet material attached to the edges of the tablet by a water insoluble adhesive, at least one of which is water impervious, or may have one of a number of alternative constructions comprising a self-adhesive tape, a coating of paint or synthetic resin, or a coating of wax. Alternatively the continuous band may be the side of a cup-like member and the tablet is sealed within the cup-like member by water impervious insoluble sealing material.

6 Claims, 8 Drawing Figures PATENTEUBEE24|974 3, 856,932 sum 1 BF 2' INVENTOR MICHAEL AXTON MAY /7 3.9 TTORNEY PATENTED 3,856,932

SHEET 2 BF 2 INVEN MICHAEL AX N MAY ATTORNEY TABLET OF A CHLORINE RELEASING SOLID COMPOUND The invention relates to tablets of a chlorine releasing solid compound. These tablets are used extensively for the water treatment and sanitisation of swimming pools. See US. Pat. No. 3,342,674 for a partial listing of available species of solid compounds capable of releasing available chlorine when contacted with water, such as a chlorinated triazine compound, or an alkaline earth metal hypochlorite compound, and mixtures thereof. One or more tablets are placed in the pool, and the surface of the tablet coming into contact with the water gives off chlorine which sanitises the pool. This process continues over a period of time, in some cases as much as 14 days, until the tablet is completely dissolved.

The tablets are usually about 3 inches in diameter and approximately 1 inch thick, but they have the disadvantage that the amount of chlorine provided by the tablet varies in quantity over the period of time. When the tablet is placed in the water the surface area is at a maximum and it gives off a maximum amount of chlorine, but as the tablet dissolves it is reduced in size and as the surface area is also reduced so the quantity of chlorine given off is reduced proportionately. For instance. if the tablet dissolves completely in 14 days, and when first placed in the water maintains one part per million of chlorine in solution in the water, after seven days the surface area has been reduced by one-third, and the amount of chlorine given off is reduced proportionately, and maintains only two-thirds of a part per million, and from the start to the finish the supply of chlorine differs from day to day in a decreasing amount due to the reduction of the surface area.

The object of the present invention is to provide a tablet of the kind referred to which overcomes this drawback and provides an even, daily supply of chlorine to the pool from start to finish.

The invention consists in a tablet of chlorine releasing solid compound having substantially parallel plane faces at least one of which faces is left completely exposed, and said tablet being sealed around its edge by a continuous band of material which is insoluble in water.

The invention further consists in a tablet as set forth in the preceding paragraph in which the sealing material is a continuous band of insoluble material.

The invention still further consists in a tablet as set forth above in which the band is formed of a length of waterproof tape.

The invention still further consists in a tablet as set forth above in which the edge thereof is rendered water-resistant by a material sprayed thereon.

The accompanying drawing shows, by way of example only, one embodiment of the invention in which:

FIG. I is a perspective view of a known tablet of 3 inches diameter and 1 inch thick;

FIG. 2 is a perspective view of the same known tablet as shown in FIG. 1 after having been immersed in water for 7 days;

FIG. 3 shows a perspective view of a tablet constructed in accordance with the present invention,

FIG. 4 shows a perspective view of a tablet of FIG. 3 having been immersed in water for seven days, while FIGS. 5, 6, 7 and 8 are cross sections of a tablet constructed in four different ways in accordance with the invention.

The tablet shown in FIG. 1 if 3 inches in diameter and 1 inch thick has a surface area of 23 /2 sq. in. and the quantity of chlorine released in water is proportional to the surface area. If such a tablet is immersed in water for seven days it is reduced to the size shown in FIG. 2 in which it has a surface area of 14 /2 sq. in. and the release of chlorine to the water has been reduced in proportion to the surface area of the tablet, as previously mentioned.

The tablet shown in FIG. 3 is of the same size as that shown in FIG. 1, but the edge is protected by a waterproof band or seal and the surface area exposed to the water is 15 sq. in. After such a tablet constructed in accordance with the invention has been left in the water for seven days the surface area still exposed to the water is the same as when first inserted, namely 15 sq. in. and in the release of chlorine to the water has remained constant over that period, and will continue to do so for substantially the whole life of the tablet.

In FIG. 5 the tablet of chlorine releasing solid compound l is housed in a cup-like member 2 by a water impervious and insoluble sealing material 3, which can conveniently be painted upon either or both the inner surfaces of this cup-like member at the edge and bottom of the tablet, and be of a rubbery nature, and the latter pressed into the former to seal both the edge and bottom against contact with the water in the swimming pool. The cup-like member may be constructed of a suitable insoluble material such as metalor plastics, or other rigid or semi-rigid material as required.

It is not essential that one of the faces of the tablet be sealed as in FIG. 5, and in consequence it is proposed in an alternative form of construction, as shown in FIGS. 6 and 7, to cover only the edge of the tablet by an impervious and water insoluble material. In FIG. 6 there is shown a rigid band of metal, plastic or other suitable material 4, in which the edge of the tablet is sealed within the ring by a sealing or adhesive compound 3. When lying on a horizontal surface in the water, the lower surface being covered, dispersion of the chlorine takes place principally from the exposed upper surface, and it acts in a similar manner to the construction of FIG. 5.

In the construction of FIG. 7 the sealing of the edge by a water impervious and water insoluble material can be carried out in a number of different ways. The water insoluble material 5 may be a band of flexible sheet material which is attached to the tablet by a water insoluble adhesive, at lest one of which is water impervious. For example, there may be applied to the tablet a selfadhesive tape, or the adhesive may be applied firstly to the edge of the tablet and the adhesive covered by a band, for example of aluminium foil, or vice versa.

In accordance with the construction of FIG. 7 the edge of the tablet may be sealed by a coating of liquid, which when dry adheres to the tablet, and forms a water insoluble and impervious seal 5. The liquid may be of a suitable paint, a synthetic resin, a natural or synthetic rubber, or it may be a coating of wax or other suitable material.

One face of the tablet may also be sealed as shown in FIG. 8 by one or other of the methods described in relation to FIG. 7, and may be the same or different from that applied to the edge of the tablet.

The layer of waterproofing does not have to be very thick, a thin coat is sufficient so long as it is just thick enough to seal the edge of the tablet against penetration of the water radially inwards, and adheres firmly to the granules face of the edge of the tablet during handling. The water must be prevented from obtaining access to the surface of the edge from the face of the tablet, under the sealing coating, and therefore it is essential that the latter should adhere firmly to the surface of the edge to prevent solution of the tablet inwardly from the edge.

If the sealing material is placed only upon the edge of the tablet, the tablets may be placed one upon another in a cylindrical form, and be sprayed together. The tablets may be used in that form, two or more together, to provide two or more times the period before replacement is required, or the tablets may be broken apart for use separately, immediately after the coating has dried, or when required for use, while other details to carry the invention into effect may be varied without departing from the scope of the invention claimed.

I claim:

1. A tablet comprised of a chlorine releasing solid chemical compound for use as an agent for sanitizing water, said tablet having substantially parallel plane faces, the surface of the edge between said substantially parallel plane faces is sealed by a continuous band of a water impervious and water insoluble waterproof material, at least one of said substantially parallel plane faces being left completely exposed for chlorine release when placed in said water so that the surface area of said tablet exposed for chlorine release in said water remains constant for substantially the entire life of said tablet.

2. A tablet as claimed in claim 1 in which the tablet edge surface sealing material is a continuous band of insoluble material which adheres to the edge surface of the tablet.

3. A tablet as claimed in claim 2 in which the continuous sealing band comprises a flexible sheet material attached to the edge of the tablet by a water insoluble adhesive, at least one of which is water impervious.

4. In the art of chlorinating swimming pools by placing one or more chlorine releasing tablets in the pool whereby the contacting of the surface of the tablet with the water in the pool gives off chlorine over a period of time, until the tablet is completely dissolved, the chlorination process improvement comprising the step of providing an even daily supply of chlorine to the pool from start to finish by placing in the pool a swimming chlorinating tablet comprised of a chlorine releasing solid chemical compound as an essential water sanitizing agent and having substantially parallel plane faces completely exposed for chlorine release when placed in water, the surface of the edge between the exposed faces being sealed by a continuous band of a water impervious and water insoluble water proof material. the tablet being so constructed that the exposed surface of the tablet remains constant over substantially the entire life of the tablet.

5. A process as claimed in claim 4 in which the tablet edge surface sealing material of the tablet employed is a continuous band of insoluble material which adheres to the edge surface of the tablet.

6. A process as claimed in claim 5 in which the continuous sealing band of the tablet employed comprises a flexible sheet material attached to the edge of the tablet by a water insoluble adhesive, at least one of which is water impervious.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US262745 *Aug 15, 1882 Manufacture of soap
US395243 *Jun 23, 1888Dec 25, 1888 Julius maggi
US740440 *Oct 6, 1903Ruel A JonesSoap cake.
US805560 *May 1, 1905Nov 28, 1905Simon N KohnGermicidal cake.
US1144186 *Nov 23, 1914Jun 22, 1915Joseph Thomas FreestoneWashing compound.
US1325361 *Jan 27, 1919Dec 16, 1919 ce tippecanoe city
US1335488 *Jun 18, 1919Mar 30, 1920Henrietta R DavisPoison-tablet
US1393253 *Apr 23, 1915Oct 11, 1921Helge O H MurraySolution-identifying means for medicinal preparations
US1413064 *Jun 10, 1919Apr 18, 1922Ivers Lee CoPackage
US1782526 *Jan 30, 1928Nov 25, 1930Beardsley Arthur LTubular container
US2051665 *Jul 1, 1935Aug 18, 1936Edward West JohnLuminous label
US2312381 *Oct 24, 1940Mar 2, 1943Bickenheuser Frank JMedicinal tablet
US2341583 *Apr 6, 1942Feb 15, 1944Richard L TuveLuminescent or phosphorescent coating material
US2517513 *Sep 20, 1946Aug 1, 1950Carl VaernetPharmaceutical preparation for implantation
US2519045 *Feb 20, 1945Aug 15, 1950Safety Fumigant CompanyFumigant briquette
US3113076 *Jul 3, 1956Dec 3, 1963Jacobs Henry RMedicinal tablets
US3279995 *May 31, 1963Oct 18, 1966Allen F ReidShaped pellets
US3342674 *Mar 3, 1965Sep 19, 1967Monsanto CoSterilizing, sanitizing, and/or disinfecting shapes
US3488420 *Mar 13, 1967Jan 6, 1970Fmc CorpControlled solubility sanitizer tablet
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4246129 *Apr 18, 1979Jan 20, 1981The Procter & Gamble CompanyToilet tank dispensers
US4370305 *Jul 18, 1980Jan 25, 1983Hoelzle & Chelius KgDevice for the sterilization of fluid substances
US4374563 *Oct 27, 1980Feb 22, 1983Olin CorporationNovel package for water sanitizing chemical and method for preparing it
US4418038 *Nov 2, 1981Nov 29, 1983Alza CorporationDisinfecting with chlorine-containing biocide dispensed from shaped polymeric body
US4460490 *Dec 17, 1981Jul 17, 1984Jeyes Group LimitedLavatory cleansing blocks
US4569780 *Jul 1, 1983Feb 11, 1986Economics Laboratory, Inc.Cast detergent-containing article and method of making and using
US4569781 *Feb 17, 1981Feb 11, 1986Economics Laboratory, Inc.Cast detergent-containing article and method of using
US4587069 *Oct 31, 1983May 6, 1986Twinoak Products, Inc.Process for producing color display means
US4654341 *Oct 7, 1985Mar 31, 1987Monsanto CompanyMethod and tablet for sanitizing toilets
US4687121 *Jan 9, 1986Aug 18, 1987Ecolab Inc.Solid block chemical dispenser for cleaning systems
US4690305 *Nov 6, 1985Sep 1, 1987Ecolab Inc.Solid block chemical dispenser for cleaning systems
US4692335 *Sep 3, 1985Sep 8, 1987Ppg Industries, Inc.Wax binder; controlled dissolving
US4816177 *Jun 11, 1987Mar 28, 1989Eltech Systems CorporationSodium sulfite dechlorination agent
US4863445 *Jul 30, 1984Sep 5, 1989Baxter Travenol Laboratories, Inc.Assembly for inhibiting microbial growth in collected fluid
US4876003 *May 9, 1988Oct 24, 1989Olin CorporationElongated capsule with tapered ends
US4923618 *Apr 3, 1989May 8, 1990Olin CorporationSkimmer, tablets, tapering, shells, apertures, dissolving, whirling
US4928813 *Jun 2, 1989May 29, 1990Olin CorporationEncased pool chemical capsule with extended ends and method of making the same
US4961872 *Apr 7, 1989Oct 9, 1990The Drackett CompanyCalcium hypochlorite tablets
US5137731 *Dec 2, 1991Aug 11, 1992Olin CorporationChemical tablet with central hole and partially exposed top and bottom
US5178787 *Mar 11, 1991Jan 12, 1993Block Drug Company, Inc.Lavatory cleaning block comprising n,n-dichloro dialkyl hydantoin and aluminum hydroxide
US5209864 *Jul 3, 1991May 11, 1993Winbro Group, Ltd.Blending alkali metal hydroxides and sequestrants, screening and shaping
US5312624 *Apr 22, 1993May 17, 1994Ecolab Inc.Sanitizing drains by dispensing chemicals in housings
US5389345 *Oct 1, 1993Feb 14, 1995Renton; Michael B.Swimming pool accessories
US5395625 *Jan 21, 1993Mar 7, 1995Jet, Inc.Fluid treatment tablet
US5759974 *Jul 30, 1996Jun 2, 1998Henkel Kommanditgesellschaft Auf AktienComprising at least two masses of different concentration for sustained release, disinfection
US6150324 *Jan 13, 1997Nov 21, 2000Ecolab, Inc.Alkali metal carbonate detergent, soil removing surfactant, sequestrant comprising an organic phosphonate and an inorganic condensed phosphate; dishwasher detergents
US6156715 *Jun 2, 1998Dec 5, 2000Ecolab Inc.Stable solid block metal protecting warewashing detergent composition
US6177392Jan 13, 1997Jan 23, 2001Ecolab Inc.Stable solid block detergent composition
US6197321 *Mar 10, 1994Mar 6, 2001Ecolab, Inc.Drain treatment product and method of use
US6258765Dec 12, 1997Jul 10, 2001Ecolab Inc.Binding agent for solid block functional material
US6410495Oct 19, 2000Jun 25, 2002Ecolab Inc.Solidified mixture of sodium carbonate and alklai metal silicate
US6436893Oct 18, 2000Aug 20, 2002Ecolab Inc.Detergent comprising alkali metal carbonate, surfactant, sequestrant comprising organic phosphonate and inorganic condensed phosphate
US6503879Mar 15, 2001Jan 7, 2003Ecolab Inc.Containing organic phosphonate and inorganic phosphate
US6583094Nov 8, 2000Jun 24, 2003Ecolab Inc.Stable solid block detergent composition
US6632291Mar 23, 2001Oct 14, 2003Ecolab Inc.Methods and compositions for cleaning, rinsing, and antimicrobial treatment of medical equipment
US6638902Feb 1, 2001Oct 28, 2003Ecolab Inc.Stable solid enzyme compositions and methods employing them
US6653266Dec 13, 2000Nov 25, 2003Ecolab Inc.An organic sequestrant that can cooperate in the formation of the binding agent containing an organo phosphonate or an organoamino acetate and water and alkali metal carbonate hydrate as binding agent; solid alkaline detergent
US6660707Jun 24, 2002Dec 9, 2003Ecolab Inc.Stable solid block metal protecting warewashing detergent composition
US6831054May 8, 2003Dec 14, 2004Ecolab Inc.Stable solid block detergent composition
US6835706Jan 7, 2003Dec 28, 2004Ecolab Inc.Alkaline detergent containing mixed organic and inorganic sequestrants resulting in improved soil removal
US7087569Nov 14, 2003Aug 8, 2006Ecolab Inc.Stable solid block metal protecting warewashing detergent composition
US7094746Dec 10, 2004Aug 22, 2006Ecolab Inc.dimensionally stable alkaline solid block warewashing detergent uses an E-form binder comprising a nonhydrated alkali metal carbonate, an organic sequestrant, and a mono-hydrated alkali metal carbonate binder
US7341987Nov 14, 2003Mar 11, 2008Ecolab Inc.Binding agent for solid block functional material
US7517846Oct 20, 2005Apr 14, 2009Ecolab Inc.Inwardly curved bar having an inner opening with an insert interlocking with the bar by insertion into the opening; each part contains a hardener and a source of alkalinity, a surfactant, an enzyme, or an antimicrobial agent; covered with a water soluble or dispersable polymeric film; cleaning detergents
US8074674Oct 5, 2007Dec 13, 2011Quik Corp Fire Pty Ltd.Block for chemically dosing a stream of fluid and an apparatus for housing the block
US8647567Mar 22, 2012Feb 11, 2014The Clorox CompanyMethods of providing uniform delivery of a functional agent from a shaped composition
US20120258156 *Mar 22, 2012Oct 11, 2012Evan RumbergerShaped compositions for uniform delivery of a functional agent
USRE32763 *Aug 27, 1986Oct 11, 1988Ecolab Inc.Cast detergent-containing article and method of making and using
USRE32818 *Aug 27, 1986Jan 3, 1989Ecolab Inc.Cast detergent-containing article and method of using
DE102008057739A1 *Nov 17, 2008May 20, 2010Buck-Chemie GmbhBeschichteter Reinigungsmittelformförper
EP2213718A1Nov 2, 2009Aug 4, 2010Buck-Chemie GmbHCoated shaped solid cleaning composition
WO1996014392A1 *Oct 30, 1995May 17, 1996Henkel KgaaFlush toilet cleansers in bar form
WO2008040091A1 *Oct 5, 2007Apr 10, 2008Quik Corp Aust Pty LtdA block for chemically dosing a stream of fluid and an apparatus for housing the block
WO2012138563A1 *Mar 30, 2012Oct 11, 2012The Clorox CompanyShaped compositions for uniform delivery of a functional agent
WO2012138564A1 *Mar 30, 2012Oct 11, 2012The Clorox CompanyMethods of providing uniform delivery of a functional agent from a shaped composition
Classifications
U.S. Classification424/405, 422/37, 210/756, 252/175, 514/241, D21/390, 206/524.6, 252/187.1, 424/661, 424/665, 252/176
International ClassificationC02F1/76, B01F1/00
Cooperative ClassificationB01F2001/0055, B01F1/00, C02F1/76
European ClassificationB01F1/00, C02F1/76