US4609845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stretched piezoelectric polymer coaxial cable
Assignee: Focas Ltd
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Filing: 1984-07-06
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Granted: 1986-09-02
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Expires: 2004-07-06
Abstract
Abstract A piezoelectric coaxial cable comprises a conductive polymer core comprising a high molecular weight polymeric material having conductive particles dispersed therein, a piezoelectric polymer layer surrounding the conductive polymer core, and an outer conductor surrounding the piezoelectric polymer layer. The high molecular weight polymeric material of the conductive polymer core comprises a polymer capable of being intimately bonded to the piezoelectric polymer.
Inventors
- 👤 Pravin L. Soni
- 👤 Nigel R. Farrar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:13
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/01; H10N30/09; H10N30/098; H10N30/60; Y; Y10; Y10S; Y10S310/00; Y10S310/80; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
105 words
A method of preparing a piezoelectric coaxial cable which comprises (a) extruding a core of a high molecular weight conductive polymer material having conductive particles dispersed therein; and (b) extruding a piezoelectric polymer layer around the core thereby forming a composite structure having an intimate bond between the polymer of the core and the piezoelectric poly-polymer; (c) stretching the resulting composite structure axially such that the length of the structure is increased at least about three times its original length; (d) applying an outer conductor onto the surface of the piezoelectric polymer layer; and (e) polarizing the piezoelectric layer to increase the piezoelectric properties thereof.
Claim 2
Independent Claim
105 words
A method of preparing a piezoelectric coaxial cable which comprises (a) extruding a core of a high molecular weight conductive polymer material having conductive particles dispersed therein; and (b) extruding a piezoelectric polymer layer around the core thereby forming a composite structure having an intimate bond between the polymer of the core and the piezoelectric poly-polymer; (c) stretching the resulting composite structure axially such that the length of the structure is increased at least about three times its original length; (d) applying an outer conductor onto the surface of the piezoelectric polymer layer; and (e) polarizing the piezoelectric layer to increase the piezoelectric properties thereof.
Claim 3
Dependent Claim
16 words
A method in accordance with claim 1 wherein the core and piezoelectric polymer layer are coextruded.
Claim 4
Dependent Claim
22 words
A method in accordance with claim 1 wherein the composite structure is stretched at a temperature between about 60° to 100° C.
Claim 5
Dependent Claim
19 words
A method in accordance with claim 1 wherein the composite structure is stretched prior to the step of polarization.
Claim 6
Dependent Claim
19 words
A method in accordance with claim 1 wherein the composite structure is stretched simultaneously with the step of polarization.
Claim 7
Dependent Claim
19 words
A method in accordance with claim 1 wherein the outer conductor is applied prior to the step of polarization.
Claim 8
Dependent Claim
18 words
A method in accordance with claim 1 wherein the outer conductor is applied after the step of polarization.
References Cited (Backward Citations)
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US3750127A
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US3971250A
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US4378721A
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US4303733A
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GB2042256A
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US4369391A
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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) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |