US3669887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric ceramic compositions
Assignee: Panasonic Holdings Corp
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Filing: 1969-07-30
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Granted: 1972-06-13
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Expires: 1989-07-30
Abstract
Abstract Piezoelectric ceramic compositions having very high mechanical quality factors and electromechanical coupling coefficients and high stabilities in resonant frequency and mechanical quality factor over a wide temperature range comprising the solid solutions defined by the lines connecting points A, B, C, D and E and the lines connecting points F, G, H, I, J and K of the diagram of FIG. 2 and further containing from 0.1 to 5 percent of MnO2.
Inventors
- 👤 Masamitsu Nishida
- 👤 Hiromu Ouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:48
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/48; C04B35/50; C04B35/51; H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
A process for the preparation of the ceramic composition of claim 1 comprising (1) intimately wet-mixing a lead oxide, a tin oxide, Nb2O5, TiO2, ZrO2 and MnO2; (2)drying said mixture; (3) pressing said mixture into a pre-determined shape; (4) pre-reacting said mixture by calcining at a temperature of about 850* C. for about 2 hours (5) cooling said calcined mixture; (6) reducing said mixture to a smaller particle size; (7) shaping said particulate mixture, and (8) firing said sHaped mixture at about 1,210*-1,310* C. for about 45 minutes.
Claim 2
Dependent Claim
101 words
A piezoelectric ceramic composition consisting essentially of a solid solution of a material selected from the area bounded by lines connecting points F, G, H, I, J and K of the diagram of FIG. 2, and further containing a quantity of manganese equivalent to from 0.1 to 5 weight percent of manganese oxide (MnO2), wherein the compositions of the points F, G, H, I, J and K have the following formulas: F. Pb(Sn1/3Nb2/3)0 200Ti0 400Zr0 400O3 G. Pb(Sn1/3Nb2/3)0 125Ti0 500Zr0 375O3 H. Pb(Sn1/3Nb2/3)0 060Ti0 510Zr0 430O3 I. Pb(Sn1/3Nb2/3)0 010Ti0 470Zr0 520O3 J. Pb(Sn1/3Nb2/3)0 060Ti0 360Zr0 580O3 K. Pb(Sn1/3Nb2/3)0 125Ti0 315Zr0 560O3.
Claim 3
Dependent Claim
13 words
An electromechanical transducer element comprising a ceramic composition as claimed in claim 3.
Claim 4
Dependent Claim
12 words
A piezoelectric transformer comprising a ceramic composition as claimed in claim 3.
Claim 5
Dependent Claim
28 words
A piezoelectric ceramic material consisting essentially of the solid solution having the following formula: Pb(Sn1/3Nb2/3)0 060Ti0 460Zr0 480O3, and further containing 0.5 weight percent of manganese oxide (MnO2).
Claim 6
Dependent Claim
28 words
A piezoelectric ceramic material consisting essentially of the solid solution having the following formula: Pb(Sn1/3Nb2/3)0 125Ti0 445Zr0 430O3, and further containing 0.5 weight percent of manganese oxide (MnO2).
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |