US4327153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite piezoelectric material in the form of a film and a method of fabrication of said material
Assignee: Thales SA
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Filing: 1980-09-15
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Granted: 1982-04-27
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Expires: 2000-09-15
Abstract
Abstract The composite material is obtained by coating a fabric with a polymer. Coating is performed either in the cold state by dipping the fabric in a solution of polymer dissolved in a solvent or in the hot state by dipping in a molten polymer. The film of composite material thus obtained is then endowed with piezoelectric properties by subjecting it to an intense electric field.
Inventors
- 👤 Francois Micheron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:12
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/852; H10N30/01; H10N30/09; H10N30/092; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31725; Y10T428/3175; Y10T428/31754; Y10T442/00; Y10T442/20; Y10T442/2762; Y10T442/2861; Y10T442/2893
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 words
A composite material endowed with piezoelectric properties by induction of electrical anisotropy, wherein said material is reinforced with at least one layer of polymer-impregnated fabric in at least one region of said material, said polymer being selected from the group consisting of polyvinylidene fluoride, polyvinyl chloride, polyvinyl fluoride, and copolymers thereof, and said electrical anisotropy having been induced by subjecting the material to a polarizing electric field normal to the faces of the material.
Claim 2
Dependent Claim
74 words
A composite material endowed with piezoelectric properties by induction of electrical anisotropy, wherein said material is reinforced with at least one layer of polymer-impregnated fabric in at least one region of said material, said polymer being selected from the group consisting of polyvinylidene fluoride, polyvinyl chloride, polyvinyl fluoride, and copolymers thereof, and said electrical anisotropy having been induced by subjecting the material to a polarizing electric field normal to the faces of the material.
Claim 3
Dependent Claim
18 words
The composite material according to claim 1, wherein the material is additionally subjected to a mechanical stretching operation.
Claim 4
Dependent Claim
16 words
The composite material according to claim 1, wherein the polarizing electric field comprises a corona discharge.
Claim 5
Dependent Claim
16 words
The composite material according to claim 1, wherein the polarizing electric field comprises a plasma discharge.
Claim 6
Dependent Claim
13 words
The composite material according to claim 1, wherein the polymer is polyvinylidene fluoride.
Claim 7
Dependent Claim
13 words
The composite material according to claim 1, wherein the polymer is polyvinyl chloride.
Claim 8
Dependent Claim
13 words
The composite material according to claim 1, wherein the polymer is polyvinyl fluoride.
Claim 9
Dependent Claim
14 words
The composite material according to claim 1, wherein the polymer is polytetrafluoroethylene-polyvinylidene fluoride copolymer.
References Cited (Backward Citations)
JPS5185499A
Cited
US4215177A
Cited
US4221757A
Cited
US4208462A
Cited
US4241128A
Cited
US4268653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-26 | 1985-10-26 | 1986-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-26 | 1989-10-26 | 1990-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-26 | 1993-10-26 | 1994-04-27 | $7700.00 | Window Closed / Lapsed |