US3580846A
Expired / Lapsed
US
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Ferroelectric ceramic materials
Assignee: Individual
•
Filing: 1969-11-10
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Granted: 1971-05-25
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Expires: 1989-11-10
Abstract
Abstract FERROELECTRIC CERAMIC MATERIALS HAVING ESSENTIALLY THE COMPOSITION PB(ZR-TI)O3 OR PB(ZR-TI-SN)O3 AND CONTAINING BI AND NB IN SMALL PERCENTAGE EXHIBIT IMPROVED COUPLING COEFFICIENTS. AS MODIFICATIONS, THE MATERIALS MAY ALSO CONTAIN MN IN SMALL PERCENTAGE AND PART OF THE PB MAY BE REPLACED BY BA, SR OR BOTH. THE MATERIALS ARE PARTICULARLY USEFUL AS CERAMIC WAVE FILTERS AND PIEZOELECTRIC VOLTAGE SOURCES.
Inventors
- 👤 Chiyoshi Okuyama
- 👤 Syuzo Osumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:22
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/48; C04B35/50; C04B35/51; H; H01; H01G; H01G7/00; H01G7/02; H01G7/025; H01G7/026; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |