US3798474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure wave piezoelectric sensor of continuous structure
Assignee: IFP Energies nouvelles
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Filing: 1972-07-05
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Granted: 1974-03-19
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Expires: 1992-07-05
Abstract
Abstract Pressure wave sensor formed of at least one elongated piezoelectric element having two faces, each associated to a flexible conducting electrode substantially over the whole length of the sensitive element. When the sensor is formed of a plurality of sensitive elements the latter are electrically connected to one another.
Inventors
- 👤 J Cholet
- 👤 J Cassand
- 👤 J Dubois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:25
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/16; G01V1/20; G01V1/201; G01V1/208; G01L; G01L23/00; G01L23/08; G01L23/10; G01L9/00; G01L9/08; H; H10; H10N; H10N30/00; H10N30/30; H10N30/302; H10N30/60; Y; Y10; Y10S; Y10S310/00; Y10S310/80
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
69 words
A pressure wave sensor of continuous structure comprising essentially at least one piezoelectric sensitive element of plastic synthetic material having two faces of great length as compared to their width, each associated with a flexible conducting electrode substantially of the same length as the sensitive element, said element associated with the electrodes being helically wound around a central core of great length, made of flexible and electrically insulating material.
Claim 2
Dependent Claim
69 words
A pressure wave sensor of continuous structure comprising essentially at least one piezoelectric sensitive element of plastic synthetic material having two faces of great length as compared to their width, each associated with a flexible conducting electrode substantially of the same length as the sensitive element, said element associated with the electrodes being helically wound around a central core of great length, made of flexible and electrically insulating material.
Claim 3
Dependent Claim
19 words
A sensor according to claim 1 wherein the electrodes are thin metal strips in contact with the sensitive element.
Claim 4
Dependent Claim
28 words
A sensor according to claim 1, wherein the electrodes consist of a metal coating formed of small metal particles directly deposited on each face of the sensitive element.
Claim 5
Dependent Claim
40 words
A pressure wave sensor according to claim 1, wherein the sensitive element associated with the electrode is wound around the central core with a winding pitch smaller at the central portion of said core than at the end portions thereof.
Claim 6
Dependent Claim
79 words
A pressure wave sensor of continuous structure, comprising essentially at least one piezoelectric sensitive element of plastic synthetic material having two faces of great length as compared to their width, each being associated with a conducting electrode substantially of the same length as the sensitive element, one of the electrodes being a cylindrical conducting core around which are helically wound the sensitive element and the other electrode, the latter being secured onto the external face of said sensitive element.
Claim 7
Dependent Claim
79 words
A pressure wave sensor of continuous structure, comprising essentially at least one piezoelectric sensitive element of plastic synthetic material having two faces of great length as compared to their width, each being associated with a conducting electrode substantially of the same length as the sensitive element, one of the electrodes being a cylindrical conducting core around which are helically wound the sensitive element and the other electrode, the latter being secured onto the external face of said sensitive element.
Claim 8
Dependent Claim
40 words
A pressure wave sensor according to claim 5, wherein the sensitive element associated with the electrode is wound around the conducting core with a winding pitch smaller at the central portion of said core than at the end portions thereof.
Claim 9
Dependent Claim
64 words
A pressure wave sensor, of continuous structure comprising essentially at least a pair of sensitive elements of plastic synthetic material having two faces of great length as compared to their width, each associated with a conducting electrode substantially of the same length as the sensitive elements, said elements associated with their respective electrodes being helically wound in reverse directions around an insulating central core.
Claim 10
Dependent Claim
64 words
A pressure wave sensor, of continuous structure comprising essentially at least a pair of sensitive elements of plastic synthetic material having two faces of great length as compared to their width, each associated with a conducting electrode substantially of the same length as the sensitive elements, said elements associated with their respective electrodes being helically wound in reverse directions around an insulating central core.
Claim 11
Dependent Claim
18 words
A pressure wave sensor according to claim 7, wherein insulating means is interposed between the two sensitive elements.
Claim 12
Dependent Claim
36 words
A pressure wave sensor according to claim 8, wherein one of the electrodes associated with one side of a sensitive element is electrically connected with the electrode on the corresponding side of the other sensitive element.
Claim 13
Dependent Claim
65 words
A pressure wave sensor of continuous structure comprising at least one piezoelectric sensitive flat strip of plastic synthetic material having two faces of great length as compared to their width each associated with a flexible conductinG electrode substantially of the same length as the sensitive element, the flat strip being pleated with a greater concentration of folds at its center than at its end parts.
Claim 14
Dependent Claim
65 words
A pressure wave sensor of continuous structure comprising at least one piezoelectric sensitive flat strip of plastic synthetic material having two faces of great length as compared to their width each associated with a flexible conductinG electrode substantially of the same length as the sensitive element, the flat strip being pleated with a greater concentration of folds at its center than at its end parts.
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |