US3833503A
Expired / Lapsed
US
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Stable pyroelectric elements
Assignee: Kureha Corp
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Filing: 1972-02-09
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Granted: 1974-09-03
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Expires: 1992-02-09
Abstract
Abstract THE STABLE PYROELECTRIC ELEMENT COMPOSED OF A VINYLIDENE FLUORIDE RESIN ELECTRET OF WHICH THE MACROSCOPIC POLARIZATIN DUE TO SPACE CHARGES HAVE BEEN DEPOLARIZED.
Inventors
- 👤 N Murayama
- 👤 H Hashizume
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:43
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023; G; G01; G01K; G01K7/00; G01K7/003; H10; H10N; H10N15/00; H10N15/10; H10N15/15
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |