US4620262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyroelectric energy converter element comprising vinylidene fluoride-trifluoroethylene copolymer
Assignee: Individual
•
Filing: 1984-09-13
•
Granted: 1986-10-28
•
Expires: 2004-09-13
Abstract
Abstract A polymeric dielectric having outstanding pyroelectric conversion properties, which essentially consists of a copolymer of vinylidene fluoride and trifluoroethylene in a molar ratio of from about 90:10 to 10:90.
Inventors
- 👤 Randall B. Olsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:44
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/16; H; H10; H10N; H10N15/00; H10N15/10; H10N15/15
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A film stack for use in a pyroelectric energy converter which essentially consists of films of a copolymer of vinylidene fluoride and trifluoroethylene in a molar ratio of from about 90:10 to about 10:90, the surfaces of said films being substantially covered on both sides with thin metallic electrodes wherein the said films are wound about a central cylindrical core in a spiral fashion to form said stack into a cylindrical form.
Claim 2
Dependent Claim
72 words
A film stack for use in a pyroelectric energy converter which essentially consists of films of a copolymer of vinylidene fluoride and trifluoroethylene in a molar ratio of from about 90:10 to about 10:90, the surfaces of said films being substantially covered on both sides with thin metallic electrodes wherein the said films are wound about a central cylindrical core in a spiral fashion to form said stack into a cylindrical form.
Claim 3
Dependent Claim
20 words
A cylindrical geometry pyroelectric energy converter wherein the energy conversion element is in cylindrical stack form according to claim 1.
Claim 4
Dependent Claim
58 words
A pyroelectric energy conversion film stack, which essentially consists of films of a copolymer of vinylidene fluoride and trifluoroethylene in a molar ratio of from about 90:10 to about 10:90, the surfaces of said films being substantially covered on both sides with thin metallic electrodes, wherein a separation between adjacent copolymer films is maintained by a screen mesh.
Claim 5
Dependent Claim
58 words
A pyroelectric energy conversion film stack, which essentially consists of films of a copolymer of vinylidene fluoride and trifluoroethylene in a molar ratio of from about 90:10 to about 10:90, the surfaces of said films being substantially covered on both sides with thin metallic electrodes, wherein a separation between adjacent copolymer films is maintained by a screen mesh.
Claim 6
Dependent Claim
76 words
A pyroelectric energy conversion film stack, which essentially consists of films of a copolymer of vinylidene fluoride and trifluoroethylene in a molar ratio of from about 90:10 to about 10:90, the surfaces of said films being substantially covered on both sides with thin metallic electrodes, wherein a separation between adjacent copolymer films is maintained by a screen mesh, and said separation is automatically maintained by means of spacers which are integral parts of said dielectric films.
Claim 7
Dependent Claim
76 words
A pyroelectric energy conversion film stack, which essentially consists of films of a copolymer of vinylidene fluoride and trifluoroethylene in a molar ratio of from about 90:10 to about 10:90, the surfaces of said films being substantially covered on both sides with thin metallic electrodes, wherein a separation between adjacent copolymer films is maintained by a screen mesh, and said separation is automatically maintained by means of spacers which are integral parts of said dielectric films.
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) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |