US4565615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glow discharge stabilization of piezoelectric polymer film
Assignee: Arkema Inc
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Filing: 1984-11-01
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Granted: 1986-01-21
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Expires: 2004-11-01
Abstract
Abstract Methods are disclosed for stabilizing poled piezoelectric and pyroelectric polymer films by exposing the poled film to a glow discharge at a reduced pressure for a sufficient period to thereby remove unwanted and unstable homo- and hetero-charges from the poled film.
Inventors
- 👤 Peter F. Radice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:19
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/01; H10N30/09; H10N30/098; B; B29; B29C; B29C59/00; B29C59/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
36 words
Method of stabilizing a poled piezoelectric and pyroelectric polymer film comprising the step of exposing surface of said film to a glow discharge at a reduced pressure for a time sufficient to form said stabilized film.
Claim 2
Dependent Claim
36 words
Method of stabilizing a poled piezoelectric and pyroelectric polymer film comprising the step of exposing surface of said film to a glow discharge at a reduced pressure for a time sufficient to form said stabilized film.
Claim 3
Dependent Claim
17 words
Method of claim 1 wherein said poled polymer film is devoid of metallized coatings on surfaces thereof.
Claim 4
Dependent Claim
20 words
Method of claim 1 wherein said poled polymer film is provided with metallized coatings on at least one surface thereof.
Claim 5
Dependent Claim
35 words
Method of claim 1 wherein said poled polymer film is maintained at a temperature between room temperature to about 100° C. during said exposing step, and preferably from about room temperature to about 50° C.
Claim 6
Dependent Claim
16 words
Method of claim 1 wherein said poled polymer film is oriented in at least one direction.
Claim 7
Dependent Claim
23 words
Method of claim 1 wherein said reduced pressure ranges between about 10 to 2000 μm, and preferably between about 30 to 120 μm.
Claim 8
Dependent Claim
15 words
Method of claim 1 wherein said glow discharge is in air at a reduced pressure.
Claim 9
Dependent Claim
40 words
Method of claim 1 wherein said glow discharge is in an ionizable gas at a reduced pressure, said ionizable gas being selected from the group consisting of helium, hydrogen, argon, nitrogen, oxygen, carbon dioxide, carbon monoxide, ammonia, and fluorocarbon gases.
Claim 10
Dependent Claim
17 words
Method of claim 1 wherein surfaces of said poled polymer film pass continuously through said glow discharge.
Claim 11
Dependent Claim
35 words
Method of claim 1 wherein said poled polymer film 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 12
Dependent Claim
13 words
Method of claim 10 wherein said polymer is a homopolymer of vinylidene fluoride.
Claim 13
Dependent Claim
26 words
Method of claim 10 wherein said polymer film is a copolymer of vinylidene fluoride and a compound selected from the group consisting of tetrafluoroethylene and trifluoroethylene.
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) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |