Patent US3791833A successfully refreshed from Google Patents.
US3791833A
Expired / Lapsed
US
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Ceramic composition
Assignee: Kyoto Ceramic Co Ltd
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Filing: 1972-01-27
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Granted: 1974-02-12
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Expires: 1992-01-27
Abstract
Abstract A colored ceramic body for use in various parts of electronic equipment, comprising at least one of A12O3 and BeO as a basic component, 0.1 to 5 percent by weight CoO and further additive chosen from the group consisting of MnO2, Cr2O3, V2O5, Fe2O3 and mixtures thereof, the total amount of CoO and further additive being 1.0 to 10 percent by weight. The ceramic body is dark in color and has excellent electrical, mechanical and thermal characteristics, and maintains an acceptably high volume resistivity even after the body has been heated in a reducing atmosphere.
Inventors
- 👤 M Sugiura
- 👤 M Hirabayashi
- 👤 Y Goto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:42
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/08; C09; C09C; C09C1/00; C09C1/0009; C01; C01P; C01P2006/00; C01P2006/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
20 words
The ceramic body of claim 1 wherein CoO is present in the amount of 0.1 to 3.0 percent by weight.
Claim 2
Dependent Claim
41 words
The ceramic body of claim 1 consisting essentially of approximately 97.0 percent by weight BeO, 0.3 percent by weight CoO, 0.7 percent by weight MnO2, 0.5 percent by weight Fe2O3, 0.5 percent by weight SiO2 and 1.0 percent by weight MgO.
Claim 3
Dependent Claim
36 words
The ceramic body of claim 1 consisting essentially of approximately 95.3 percent by weight Al2O3, 0.4 percent by weight CoO, 2.0 percent by weight MnO2, 2.0 percent by weight Cr2O3 and 0.3 percent by weight V2O5.
Claim 4
Dependent Claim
46 words
The ceramic body of claim 1 consisting essentially of approximately 91.0 percent by weight Al2O3, 0.5 percent by weight CoO, 3.7 percent by weight MnO2, 2.1 percent by weight Cr2O3, 0.3 percent by weight V2O5, 0.4 percent by weight SiO2, and 2.0 percent by weight TiO2.
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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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |