Patent US4031502A successfully refreshed from Google Patents.
US4031502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophone with acoustic reflector
Assignee: Government of France
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Filing: 1976-04-07
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Granted: 1977-06-21
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Expires: 1996-04-07
Abstract
Abstract A hydrophone comprising an acoustical reflector constituted by a sealed, flexible and deformable container containing two rigid parallel plates separated by lattice sheets of interlaced filaments and at least one piezoelectric transducer with a thin flexible blade fixed at its periphery to a rigid annular support. The reflector and the transducer are entirely embedded in a common synthetic resin layer having a thickness of several millimeters which secures them together and maintains the transducer in proximity to the front face of the acoustical reflector. The layer of resin has a reduced thickness of the order of 1 mm facing the transducer.
Inventors
- 👤 Francois L. M. Lefaudeux
- 👤 Michel Georges Quivy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:24
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0603; G; G10; G10K; G10K11/00; G10K11/18; G10K11/20; G10K11/205
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
A hydrophone comprising an acoustical reflector, at least one transducer disposed adjacent said reflector, and a common envelope for said transducer and reflector; said reflector comprising a flexible sealed container, two rigid parallel plates disposed in said container and sheets of interlaced filaments disposed between said plates, said transducer being a piezoelectric transducer comprising a thin flexible blade in the form of a disc, at least one piezoelectric disc fixed to a surface of said blade, and a rigid annular ring to which said blade is fixed at the periphery thereof, said reflector and transducer being entirely embedded in said common envelope with said flexible blade in immediate proximity to said reflector.
Claim 2
Dependent Claim
112 words
A hydrophone comprising an acoustical reflector, at least one transducer disposed adjacent said reflector, and a common envelope for said transducer and reflector; said reflector comprising a flexible sealed container, two rigid parallel plates disposed in said container and sheets of interlaced filaments disposed between said plates, said transducer being a piezoelectric transducer comprising a thin flexible blade in the form of a disc, at least one piezoelectric disc fixed to a surface of said blade, and a rigid annular ring to which said blade is fixed at the periphery thereof, said reflector and transducer being entirely embedded in said common envelope with said flexible blade in immediate proximity to said reflector.
Claim 3
Dependent Claim
23 words
A hydrophone as claimed in claim 1 wherein said envelope is constituted of a synthetic resin having a thickness of about several millimeters.
Claim 4
Dependent Claim
23 words
A hydrophone as claimed in claim 1 wherein said envelope has an area of reduced thickness of about 1 mm. facing said transducer.
Claim 5
Dependent Claim
38 words
A hydrophone as claimed in claim 1 wherein said rigid annular ring has one surface facing said reflector and an opposite surface facing away from said reflector, said blade being fixed to said one surface of the ring.
Claim 6
Dependent Claim
26 words
A hydrophone as claimed in claim 1 wherein the ratio of the surface area of the reflector to that of the transducer is at least 20.
Claim 7
Dependent Claim
23 words
A hydrophone as claimed in claim 1 wherein a plurality of said transducers are connected in series to form an overall transducer assembly.
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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) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |