Patent US4568851A successfully refreshed from Google Patents.
US4568851A
Expired / Lapsed
US
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Piezoelectric coaxial cable having a helical inner conductor
Assignee: Focas Ltd
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Filing: 1984-09-11
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Granted: 1986-02-04
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Expires: 2004-09-11
Abstract
Abstract A piezoelectric coaxial cable comprising a metallic helically wound inner conductor, the volume within the helix being filled with a solid material; a continuous piezoelectric polymer layer circumferentially surrounding the inner conductor; and an outer conductor in contact with the piezoelectric polymer layer but separated from the inner conductor.
Inventors
- 👤 Pravin L. Soni
- 👤 Peter I. C. Turk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:22
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/60
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
52 words
A piezoelectric coaxial cable comprising (a) a metallic helically wound inner conductor, the volume within the helix being filled with a solid material; (b) a continuous piezoelectric polymer layer circumferentially surrounding the inner conductor; and (c) an outer conductor in contact with the piezoelectric polymer layer but separated from the inner conductor.
Claim 2
Dependent Claim
52 words
A piezoelectric coaxial cable comprising (a) a metallic helically wound inner conductor, the volume within the helix being filled with a solid material; (b) a continuous piezoelectric polymer layer circumferentially surrounding the inner conductor; and (c) an outer conductor in contact with the piezoelectric polymer layer but separated from the inner conductor.
Claim 3
Dependent Claim
33 words
A piezoelectric coaxial cable according to claim 1 further comprising a continuous circumferential conductive polymer layer in contact with the inner conductor and the piezoelectric polymer layer but separated from the outer conductor.
Claim 4
Dependent Claim
21 words
A piezoelectric coaxial cable according to claim 1 or claim 2 wherein the piezoelectric polymer layer comprises a vinylidene fluoride polymer.
Claim 5
Dependent Claim
20 words
A piezoelectric coaxial cable according to claim 1 or claim 2 wherein the piezoelectric polymer layer comprises vinylidene fluoride homopolymer.
Claim 6
Dependent Claim
23 words
A piezoelectric coaxial cable according to claim 1 or claim 2 wherein the volume within the helix is filled with a conductive polymer.
Claim 7
Dependent Claim
21 words
A piezoelectric coaxial cable according to claim 1 or claim 2 further comprising an electrically insulating jacket over the outer conductor.
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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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |