US3764529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing fine grain ceramic barium titanate
Assignee: Panasonic Holdings Corp
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Filing: 1972-02-17
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Granted: 1973-10-09
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Expires: 1992-02-17
Abstract
Abstract A method of manufacturing fine grain barium titanate ceramic bodies from compositions including semiconducting barium titanate ordinarily doped with Nb2O5, Ta2O5, Sb2O5, Bi2O3, La2O3, CeO2, Gd2O3, Sm2O3, and Y2O3, and dielectric barium titanate. Barium sulfate is included as a starting ingredient in the barium titanate materials, and the materials are calcined and fired in a conventional manner. The resulting ceramic materials have uniform fine grain size.
Inventors
- 👤 S Hayakawa
- 👤 Y Matsuo
- 👤 H Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:40
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043; H01C7/045; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; C04B35/4684
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
A method as claimed in claim 1 wherein said primary mixture has a composition, consisting essentially of 99.5 to 99.995 weight % of BaTiO3 and 0.005 to 0.5 weight % of one oxide selected from the group consisting of Nb2O5, Ta2O5, Sb2O3, Bi2O3, La2O3, CeO2, Gd2O3, Sm2O3 and Y2O3.
Claim 2
Dependent Claim
31 words
A method as claimed in claim 2 wherein said primary mixture is calcined at a temperature of 1000 to 1200*C and then admixed with 0.05 to 2.00 weight % of BaSO4.
Claim 3
Dependent Claim
35 words
A method as claimed in claim 1 wherein said composition has 1 to 35 atom % of Ba replaced by an equivalent amount of one element selected from the group consisting of Sr and Pb.
Claim 4
Dependent Claim
35 words
A method as claimed in claim 1 wherein said composition has 1 to 20 atom % of Ti replaced by an equivalent amount of one element selected from the group consisting of Sn and Zr.
References Cited (Backward Citations)
US3028248A
Cited
US3673119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |