Patent US5447509A successfully refreshed from Google Patents.
US4400805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustically filtered transducer
Assignee: Boeing North American Inc
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Filing: 1981-04-27
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Granted: 1983-08-23
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Expires: 2001-04-27
Abstract
Abstract Disclosed is an acoustic transducer which includes a pressure tight vessel with a window in the vessel which is transparent to acoustic wave energy. A gas is disposed within the vessel, while an electromechanical transducer is located within the vessel at an antinode for a resonant wave of the gas. A port communicates with the interior of the vessel, with a pressure control coupled to the port and to a source of the gas for controlling the pressure of the fluid within the vessel.
Inventors
- 👤 Harry Nadler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:06
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/02; G10K11/04; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
56 words
An acoustic transducer, comprising: a pressure tight vessel; a compressible fluid disposed within said vessel; an electromechanical transducer disposed within said vessel at an antinode of a characteristic resonance pattern for said fluid within said vessel; and a port communicating with the interior of said vessel for changing the pressure of said fluid within said vessel.
Claim 2
Dependent Claim
56 words
An acoustic transducer, comprising: a pressure tight vessel; a compressible fluid disposed within said vessel; an electromechanical transducer disposed within said vessel at an antinode of a characteristic resonance pattern for said fluid within said vessel; and a port communicating with the interior of said vessel for changing the pressure of said fluid within said vessel.
Claim 3
Dependent Claim
20 words
The transducer of claim 1, further comprising an acoustically transparent window in said vessel for admitting acoustic wave energy therein.
Claim 4
Dependent Claim
13 words
The transducer of claim 2, wherein said fluid further comprises a gaseous fluid.
Claim 5
Dependent Claim
33 words
The transducer of claim 3, further comprising a source of said fluid and a pressure control coupled to said port and said source for controlling the pressure of said fluid within said vessel.
Claim 6
Dependent Claim
75 words
An acoustic transducer, comprising: a pressure tight vessel; an acoustically transparent window in said vessel; a gas disposed within said vessel; an electromechanical transducer disposed within said vessel at an antinode for a resonant wave of said gas within said vessel; a port communicating with the interior of said vessel; and a pressure control coupled to said port and to a source of said gas for controlling the pressure of said fluid within said vessel.
Claim 7
Dependent Claim
75 words
An acoustic transducer, comprising: a pressure tight vessel; an acoustically transparent window in said vessel; a gas disposed within said vessel; an electromechanical transducer disposed within said vessel at an antinode for a resonant wave of said gas within said vessel; a port communicating with the interior of said vessel; and a pressure control coupled to said port and to a source of said gas for controlling the pressure of said fluid within said vessel.
Claim 8
Independent Claim
45 words
A method of converting acoustic wave energy to an electrical signal, comprising the steps of: placing an electromechanical transducer within a pressure tight vessel at an antinode of a resonant wave, and pressurizing the vessel to achieve a resonance at a predetermined acoustic wave frequency.
Claim 9
Independent Claim
45 words
A method of converting acoustic wave energy to an electrical signal, comprising the steps of: placing an electromechanical transducer within a pressure tight vessel at an antinode of a resonant wave, and pressurizing the vessel to achieve a resonance at a predetermined acoustic wave frequency.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |