US3649540A
Expired / Lapsed
US
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Piezoelectric ceramic compositions
Assignee: Panasonic Holdings Corp
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Filing: 1969-09-05
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Granted: 1972-03-14
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Expires: 1989-09-05
Abstract
Abstract PIEZOELECTRIC CERAMIC COMPOSITIONS HAVING VERY HIGH MECHANICAL QUALITY FACTORS AND ELECTROMECHANICAL COUPLING COEFFICENTS AND HIGH STABILITIES IN RESONANT FREQUENCY AND MECHANICAL QUALITY FACTOR OVER A WIDE TEMPERATURE RANGE COMPRISING THE SOLID SOLUTIONS OF PB(CU1/4NB3/4)O3-PBTIO3-PBZRO3 DEFINED BY THE LINES CONNECTING POINTS A, B, C, D AND E AND THE LINES CONNECTING F, G, H, I, J AND K OF THE DIAGRAM OF FIG. 2 AND FURTHER CONTAINING FROM 0.1 TO 3 WEIGHT PERCENT OF MNO2.
Inventors
- 👤 Masamitsu Nishida
- 👤 Hiromu Ouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:51
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/025; H01G7/026; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/48; C04B35/50; C04B35/51
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |