US3764966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater earphone
Assignee: United States Department of the Navy
•
Filing: 1972-03-08
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Granted: 1973-10-09
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Expires: 1992-03-08
Abstract
Abstract An underwater earphone having a cylindrical casing sealed at one end by the vibratable diaphragm and at the other end by a flexible rubber diaphragm. The casing, including pole pieces and energizing coils is filled with silicone oil providing damping. This construction equalizes the pressure on either side of the vibratable diaphragm and prevents the ingress of water.
Inventors
- 👤 L Abbagnaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:48
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72; H; H04; H04R; H04R13/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
An earphone for use in an underwater environment comprising: a cylindrical casing; an electromagnetic circuit contained in said casing including; a pair of soft iron pole pieces, a permanent magnet affixed between the ends of said pole pieces, and a pair of series-connected coils, each of which surrounds one of said pair of pole pieces; a vibratable diaphragm completing said circuit thru an air gap and sealingly secured at its periphery to the front end of said casing; a flexible diaphragm sealedly secured at its periphery to the rear end of said casing; and an incompressible fluid completely filling said casing, whereby an ambient pressure on the face of said vibratable diaphragm is counteracted by an equal and opposite pressure from the inside of said casing transmitted through said fluid and by said flexible diaphragm in contact with the environment.
Claim 2
Dependent Claim
140 words
An earphone for use in an underwater environment comprising: a cylindrical casing; an electromagnetic circuit contained in said casing including; a pair of soft iron pole pieces, a permanent magnet affixed between the ends of said pole pieces, and a pair of series-connected coils, each of which surrounds one of said pair of pole pieces; a vibratable diaphragm completing said circuit thru an air gap and sealingly secured at its periphery to the front end of said casing; a flexible diaphragm sealedly secured at its periphery to the rear end of said casing; and an incompressible fluid completely filling said casing, whereby an ambient pressure on the face of said vibratable diaphragm is counteracted by an equal and opposite pressure from the inside of said casing transmitted through said fluid and by said flexible diaphragm in contact with the environment.
Claim 3
Dependent Claim
14 words
The earphone of claim 1 wherein said vibratable diaphragm is composed of Vanadium Permandue.
Claim 4
Dependent Claim
13 words
The earphone of claim 2 wherein said flexible diaphragm is composed of rubber.
Claim 5
Dependent Claim
12 words
The earphone of claim 3 wherein said imcompressible fluid comprises silicone oil.
Claim 6
Dependent Claim
35 words
The earphone of claim 4 wherein said electromagnetic circuit is secured to said casing by an apertured disc whereby flow of said silicone oil is permitted from the front to the rear of said casing.
References Cited (Backward Citations)
US3174129A
Cited
US3351900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |