Patent US4427609A successfully refreshed from Google Patents.
US4427609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing piezoelectric polymer films
Assignee: Thales SA
•
Filing: 1981-09-16
•
Granted: 1984-01-24
•
Expires: 2001-09-16
Abstract
Abstract The invention relates to piezoelectric polymer films. The invention relates to a production process consisting of stretching a polymer material blank by rolling under an electrical field between two oppositely rotating rollers. The invention is more particularly applicable to the production of electromechanical transducers, whose active elements are constituted by piezoelectric polymer films provided with electrodes.
Inventors
- 👤 Dominique Broussoux
- 👤 Hugues Facoetti
- 👤 Francois Micheron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:03
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/01; H10N30/09; H10N30/098; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/3154
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
91 words
A process for the production of a piezoelectric polymer film by mechanical stretching and electrical polarization, comprising forming a wafer shaped polymer material blank in the α phase, whose thickness exceeds that of the film and reducing the thickness of this blank solely by a rolling operation between a pair of rollers defining between them a crushing area under an electric field applied across the thickness of the film in the crushing area and at a speed sufficiently slow to produce the said mechanical stretching and simultaneously the said electrical polarization.
Claim 2
Dependent Claim
91 words
A process for the production of a piezoelectric polymer film by mechanical stretching and electrical polarization, comprising forming a wafer shaped polymer material blank in the α phase, whose thickness exceeds that of the film and reducing the thickness of this blank solely by a rolling operation between a pair of rollers defining between them a crushing area under an electric field applied across the thickness of the film in the crushing area and at a speed sufficiently slow to produce the said mechanical stretching and simultaneously the said electrical polarization.
Claim 3
Dependent Claim
19 words
A process according to claim 1, wherein the blank comprises a plurality of superimposed films, which are rolled simultaneously.
Claim 4
Dependent Claim
17 words
A process according to claim 2, wherein the blank is provided with at least one intermediate electrode.
Claim 5
Dependent Claim
26 words
A process according to claim 1, wherein the rolling operation is carried out by two oppositely rotating conductive rollers between which is applied a polarization voltage.
Claim 6
Dependent Claim
35 words
A process according to claim 3, wherein the rolling operation is performed by two oppositely rotating conductive rollers, the electrical polarization being obtained by connecting the intermediate electrode and the rollers to a voltage source.
Claim 7
Dependent Claim
30 words
A process according to claim 3, wherein the rolling operation is carried out by two oppositely rotating rollers, the polarization being obtained by applying a voltage between two intermediate electrodes.
Claim 8
Dependent Claim
24 words
A process according to claim 3, wherein the intermediate electrode is a fluid electrode which is transversely defined with respect to the rolling direction.
Claim 9
Dependent Claim
18 words
A process according to claim 7, wherein the fluid electrode is constituted by a polymerizable conductive adhesive substance.
Claim 10
Dependent Claim
36 words
A process according to claim 7, wherein several fluid electrodes are deposited on the same face of the film and insulated from one another by inserted dielectric partitions arranged in network form on the said face.
Claim 11
Dependent Claim
14 words
A process according to claim 1, wherein the electrical polarization is modulated during rolling.
Claim 12
Dependent Claim
21 words
A process according to claim 1, wherein the rolling temperature is below the thermoplasticity threshold of the polymer constituting the film.
Claim 13
Dependent Claim
11 words
A process according to claim 2, wherein the films are identical.
Claim 14
Dependent Claim
31 words
A process according to claim 2, wherein the films comprise at least one film which is able to acquire the piezoelectric properties and at least one film of another polymer material.
Claim 15
Dependent Claim
16 words
A process according to claim 1, wherein the blank is subject to two crossed rolling passes.
References Cited (Backward Citations)
US3691264A
Cited
US3967027A
Cited
US3931446A
Cited
US3833503A
Cited
US3878274A
Cited
US3943614A
Cited
US3985914A
Cited
US4079437A
Cited
US4055878A
Cited
US4127681A
Cited
DE2845255A1
Cited
US4284921A
Cited
US4290983A
Cited
US4346505A
Cited
US4241128A
Cited
US4268653A
Cited
US4340786A
Cited
US4302408A
Cited
US4308370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |