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US4055878A
Expired / Lapsed
US
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Stabilization of piezoelectric resin elements
Assignee: Arkema Inc
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Filing: 1976-09-24
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Granted: 1977-11-01
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Expires: 1996-09-24
Abstract
Abstract A stabilized piezoelectric resin element is produced by applying high pressure to a poled piezoelectric resin element for a given time and short circuiting the surface of said element under pressure.
Inventors
- 👤 Peter Francis Radice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:25
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023; H10; H10N; H10N30/00; H10N30/01; H10N30/04; H10N30/045; H10N30/09; H10N30/098; H10N30/50; Y; Y10; Y10S; Y10S310/00; Y10S310/80; Y10T; Y10T29/00; Y10T29/42; Y10T29/49; Y10T29/49002
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
45 words
A method of stabilizing a poled piezoelectric resin element comprising applying pressure in excess of 20 p.s.i. to said element while its surfaces are electrically short circuited, said pressure being applied in an amount and for a time sufficient to provide a stabilized piezoelectric element.
Claim 2
Independent Claim
45 words
A method of stabilizing a poled piezoelectric resin element comprising applying pressure in excess of 20 p.s.i. to said element while its surfaces are electrically short circuited, said pressure being applied in an amount and for a time sufficient to provide a stabilized piezoelectric element.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said pressure is at least 200 p.s.i.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein said pressure is at least about 800 p.s.i.
Claim 5
Dependent Claim
26 words
The method of claim 1 wherein said resin is heated to a temperature within the range of from just above room temperature to about 120° C.
Claim 6
Dependent Claim
33 words
The method of claim 1 wherein said resin is a polymer of at least 65 mol percent vinylidene fluoride and from 0 to 35 mol percent of at least one other copolymerizable monomer.
Claim 7
Dependent Claim
25 words
The method of claim 5 wherein said resin is a copolymer of about 65-75 weight percent vinylidene fluoride and about 35-25 weight percent of tetrafluoroethylene.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein said piezoelectric element has permanently adhering electroconductive surfaces on at least one side thereof.
Claim 9
Dependent Claim
21 words
The method of claim 7 wherein said piezoelectric resin element is a film and said pressure is at least 200 p.s.i.
Claim 10
Dependent Claim
34 words
The method of claim 8 wherein said resin is a polymer of at least 65 mol percent of vinylidene fluoride and from 0 to 35 mol percent of at least one other copolymerizable monomer.
Claim 11
Dependent Claim
14 words
The method of claim 9 wherein said pressure is at least about 800 p.s.i.
Claim 12
Dependent Claim
14 words
The method of claim 9 wherein said pressure is at least about 1600 p.s.i.
Claim 13
Dependent Claim
15 words
The method of claim 9 wherein said film is oriented in at least one direction.
Claim 14
Dependent Claim
26 words
The method of claim 9 wherein said resin is a copolymer of about 65-75 weight percent of vinylidene fluoride and about 35-25 weight percent of tetrafluoroethylene.
Claim 15
Dependent Claim
14 words
The method of claim 9 wherein said resin is a homopolymer of vinylidene fluoride.
Claim 16
Dependent Claim
26 words
The method of claim 9 wherein the resin is heated to a temperature within the range of from just above room temperature to about 120° C.
Claim 17
Dependent Claim
20 words
The method of claim 11 wherein the pressure is applied for a total time of at least about 30 minutes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |