US3889230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitive transducer and method of using the same
Assignee: Woods Hole Oceanographic Institution
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Filing: 1966-09-02
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Granted: 1975-06-10
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Expires: 1986-09-02
Abstract
Abstract A capacitive type pressure sensitive transducer having the general form of a coaxial cable may be used as a continuous line hydrophone. The transducer has minimum sensitivity to pressure waves travelling parallel to its principal dimension, but high sensitivity in the directions normal to it. An inner conductive member is covered by a compressible cellular dielectric layer, over which is another conductive member of cylindrical configuration.
Inventors
- 👤 Sydney T Knott
- 👤 Frederick R Hess
- 👤 Richard T Nowak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:15
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/16; G01V1/20; G01V1/201; G01V1/208; D; D07; D07B; D07B1/00; D07B1/14; D07B1/147
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
A capacitive line transducer system including a line transducer and an amplifier, said line transducer having, in concentric formation, an inner electrically conductive first member having a cylindrical surface area, a uniform substantially compressible cellular dielectric layer entirely covering the first member, an outer radially flexible electrically conductive third member over the dielectric layer and having a hollow cylindrical configuration and an insulating layer surrounding the third member, said amplifier being connected between said electrically conductive members and adapted to produce a signal varying with fluctuations in the capacity therebetween.
Claim 2
Dependent Claim
90 words
A capacitive line transducer system including a line transducer and an amplifier, said line transducer having, in concentric formation, an inner electrically conductive first member having a cylindrical surface area, a uniform substantially compressible cellular dielectric layer entirely covering the first member, an outer radially flexible electrically conductive third member over the dielectric layer and having a hollow cylindrical configuration and an insulating layer surrounding the third member, said amplifier being connected between said electrically conductive members and adapted to produce a signal varying with fluctuations in the capacity therebetween.
Claim 3
Dependent Claim
25 words
The combination according to claim 1, in which at least one of the electrically conductive members consists of a flexible solid electrically conductive plastic material.
Claim 4
Dependent Claim
19 words
The combination according to claim 1 in which the cross section of the transducer is uniform in all directions.
Claim 5
Dependent Claim
21 words
The combination according to claim 1 with a body of flexible relatively incompressible material surrounded by and supporting the first member.
Claim 6
Dependent Claim
31 words
The combination according to claim 1, with a core having substantial tensile strength and a body of flexible, relatively incompressible material over the core surrounded by and supporting the first member.
Claim 7
Dependent Claim
17 words
The combination according to claim 1, in which the dielectric layer comprises a closed cellular foam material.
Claim 8
Dependent Claim
26 words
The combination according to claim 1, in which at least one of the electrically conductive members includes a metallic strand imbedded in close electrical connection therewith.
Claim 9
Dependent Claim
39 words
The combination according to claim 1, with a body of closed cellular flexible foam material surrounded by and supporting the first member and being of sufficient cross-sectional area to impart a predetermined degree of cross-sectional density relative to water.
Claim 10
Dependent Claim
13 words
The combination of claim 4 with an insulated electrical conductor adjacent the core.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |