US3769096A
Expired / Lapsed
US
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Pyroelectric devices
Assignee: AT&T Inc
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Filing: 1971-03-12
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Granted: 1973-10-30
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Expires: 1991-03-12
Abstract
Abstract Sensitive pyroelectric detectors are readily fabricated from thin films of organic polymer materials having net dipolar moments. Such materials, exemplified by polyvinylidene fluoride, are prepared for use by mechanical working so as to produce crystallographic alignment and by electrical poling so as to produce dipolar orientation. Depending upon a variety of factors such as molecular weight, operating temperature, etc., remanent polarization may be sufficient to permit discontinuance of poling during use.
Inventors
- 👤 A Ashkin
- 👤 J Bergman
- 👤 J Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:58
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/20; G01J1/34; G01K; G01K7/00; G01K7/003; H; H10; H10N; H10N15/00; H10N15/10
Claims Analysis
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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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |