Patent US3607323A successfully refreshed from Google Patents.
US3607323A
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Sintered stabilized zirconia containing discontinuous phase of cobalt-containing oxide
Assignee: General Electric Co
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Filing: 1968-07-31
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Granted: 1971-09-21
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Expires: 1988-07-31
Abstract
Abstract The resistance of a zirconia mass or layer to gas penetration is maximized by sintering the zirconia body with a cobalt-containing sintering agent present therein as a separate phase. In the case of stabilized zirconia the cobalt-containing sintering agent may be introduced either during or after stabilization.
Inventors
- 👤 Craig S Tedmon Jr
- 👤 Stephan P Mitoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:42
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/10; H01M8/12; H01M8/124; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/48; C04B35/50; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
75 words
In the densification of zirconia by the addition of a sintering agent thereto before sintering to provide a second phase during exposure of the zirconia to sintering temperatures in excess of about 1200* C., the improvement wherein the sintering agent added is a cobalt compound with the weight of cobalt present being in the range of from about one-fourth to about 5 percent of the zirconia mass, whereby the sintered zirconia exhibits only ionic conductivity.
Claim 2
Dependent Claim
12 words
The improvement as recited in claim 2 wherein the zirconia is stabilized.
Claim 3
Dependent Claim
14 words
The improvement as recited in claim 3 wherein the cobalt compound is cobalt oxide.
References Cited (Backward Citations)
US3410728A
Cited
US3436269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |