Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS1791377 A
Publication typeGrant
Publication dateFeb 3, 1931
Filing dateFeb 20, 1929
Priority dateFeb 20, 1929
Publication numberUS 1791377 A, US 1791377A, US-A-1791377, US1791377 A, US1791377A
InventorsHarold Shevers, Proskauer Julien J
Original AssigneeHarold Shevers, Proskauer Julien J
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric filter device or system
US 1791377 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Feb. 3, 1931. .1. J. PROSKAUER ETAL. 1,791,377


ELECTRIC FILTER DEVICE OB SYSTEM Application filed February 20, 1929. Serial No. 341,437.

tutes a single unit which may be connected with radio receivers now in use without requiring any change in the receiver and wh1ch may be installed by one unskilled in the art of radio.

A further object of the invention is the provision of a filter device which may plugged into the wall socket of an electric 2O lighting system and to which the lead cable from the radio receiver may be connected by inserting the plug thereon into the socket with which the device is provided, thus requiring no instruments and no possibility of error when installing.

A still further object of the invention is to provide an electric filter which includes a pair of radio frequency choke coils arranged in the power line and a pair of con densers respectively connected to the coils with a common ground leading from the condensers.

With these and other objects in view, the invention resides in certain novel construction and combination and arrangement of parts, the essential features of which are hereinafter fully described, are particularly pointed out in the appended claim, andare illustrated in the accompanying drawing,

in which Figure 1 is a perspective view of our improved filter in use.

Figure 2 is a perspective view of the several connected parts removed from their housing.

Figure 3 is a diagrammatic view of the filter.

Referring to the drawing by reference characters, the numeral 10 designates our improved electric filter in its entirety which includes a can shaped receptacle 11 having a removable cover '12 closing the open'top of the same. Fixed to the underside of the cover is an electric plug receiving socket 13 which opens through the'top" of the cover for a purpose to be presently explained. The cover isalso provided with an opening 14 for the passage of'certain wires hereinafter explained.

Contained within the receptacle 11 are a .pair of radio frequency coils A and A which are Wound upon cardboard cores or frames 14, the convolutions of the coils being held to the cores by tapes 15 suitably tied together as shown in Figure 2 of the drawing. The as outer ends of the coils A and A are connected by wires B and 'B' respectively which connect with the respective terminals of the socket 13. Also connected to the outer ends of the coils are wires C'and C which have connections with condensers D and D respectively. The two condensers are taped together as at 16 into a single unit while a common ground wire E connects with the condensers 'and passes out through the opening 14 in the cover 12. It will be noted that the two condensers are interposed between the two choke coils, while Wires F and F connect with the'inner ends of the respec tive coils A and A and are housed in a single cord G which passes out through the open-v ing 14, the free end of the wire being connected toan attachment plug H. r

' To operatively connect the filter device 10 with a radio receiver I as shown in Figure 1 of the drawings, the plug H is inserted in an electric'socket- J while the plug K provided on the lead L from the radio receiver I is inserted into the socket 1 3. The ground wire E is attached to any convenient ground such as a water pipe or the like and the device is now set for operation. In practice, the electric current from the source of supply first passes through the coils A and A wiich act to filter the sound or electrical noise frequencies which may be present therein, and which electrical noise frequencies are taken out when passing through the condensers by reason of the fact that the natural condenser capacity absorbs the same and which passes to the ground through the wire E.

If desired, the container 11 may be filled with pitch or the like to maintain the several parts in a set position and the cover 12 sealed thereon. This will also prevent tampering with the parts by those unskilled in the art as the device is capable of long life if undisturbed.

Although, we have described the filter device for use in connection with a radio receiver, the same may also be used with other electrical household appliances, such as electric refrigerators, vacuum cleaners, oil burners and any other noise interfering apparatus as it may be that the noises present in a radio receiving set are not from the line feeding the receiver, but from some household appliance. It might also be found practical for eliminating generator noises where direct current is being converted into alternating current for use with alternating current operated radio receiving sets.

While we have described what we deem to be the most desirable embodiment of our invention, it is obvious that many of the details may be varied without in any way departing from the spirit of our invention and we therefore do not limit ourselves to the exact details of construction herein set forth nor to anything less than the whole of our invention limited only by the appended claim.

What is claimed as new is 2- In an electric filter device for eliminating extraneous oscillations from a radio apparatus and adapted to be inserted in the circuit connecting said radio apparatus to a main power supply circuit, the combination with the said power supply circuit of a pluralityof rectangularly shaped choke coils, each of said coils comprising a plurality of rectangular turns and rectangular stiffening members, means for connecting one end of each of said choke coils to said power supply circuit, a pair of rectangular condensers connected in series relationship to the other ends of said choke coils, means for binding said condensers together to form a compact unitary structure, means comprising a cylindrical container provided with an opening and adapted to receive and protect said choke coils and said condensers,

.means carried by a part of said container.

for establishing a connection from said radio apparatus to the common connection be signatures.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2705759 *Nov 7, 1952Apr 5, 1955Taggart Robert WRadio frequency noise elimination
US2928012 *Dec 15, 1954Mar 8, 1960Internat Electric Fence Co IncElectric fence interference eliminator
US2939095 *Feb 26, 1957May 31, 1960Sprague Electric CoLine filter
US5073924 *May 1, 1990Dec 17, 1991Frisby Kenneth GTelephone line noise filter apparatus
U.S. Classification333/181, 455/298, 307/105, 336/209, 336/96, 455/307
International ClassificationH04B15/02
Cooperative ClassificationH04B15/02
European ClassificationH04B15/02