Patent US2937102A successfully refreshed from Google Patents.
US2937102A
Expired / Lapsed
US
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Zirconia stabilization control
Assignee: Zirconium Corp of America
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Filing: 1957-03-18
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Granted: 1960-05-17
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Expires: 1977-03-18
Abstract
No abstract record available.
Inventors
- 👤 Harold C Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:54
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/46; C04B35/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
THE METHOD OF DE-STABILIZING ZIRCONIA FOR HIGH HEAT SHOCK RESISTANCE COMPRISING ADDING TO A STARTING ZIRCONIA CONTAINING CAO AND MGO AS THE STARTING AGENT SAID ZIRCONIA HAVING MORE THAN 95 PERCENT IN THE STABILIZED CUBIC FORM WITH THE STABILIZING AGENT IN SOLID SOLUTION WITH THE ZRO2, SUFFICIENT ACID REFRACTORY CHOSEN FROM THE GROUP CONSISTING OF SILICA AND ALUMINA TO NEUTRALIZE THAT PORTION OF THE CAO AND MGO IN SAID STARTING ZIRCONIA SO AS TO LEAVE UNNEUTRALIZED BETWEEN APPROXIMATELY 8.23 TO 9.35 MOLE PERCENT TO CAO PLUS MGO THEREIN, AND FIRING SAID ZIRCONIA MIXTURE APPROXIMATELY IN THE TEMPERATURE RANGE 2400 DEGREES FAHFENHEIT TO 2900 DEGREES FAHRENHEIT IN AN OXIDIZING ATMOSPHERE, TO PROVIDE ZIRCONIA HAVING APPROXIMATELY 8 PERCENT TO 20 PERCENT THEREOF IN MONOCLINIC FORM.
Claim 2
Independent Claim
123 words
THE METHOD OF DE-STABILIZING ZIRCONIA FOR HIGH HEAT SHOCK RESISTANCE COMPRISING ADDING TO A STARTING ZIRCONIA CONTAINING CAO AND MGO AS THE STARTING AGENT SAID ZIRCONIA HAVING MORE THAN 95 PERCENT IN THE STABILIZED CUBIC FORM WITH THE STABILIZING AGENT IN SOLID SOLUTION WITH THE ZRO2, SUFFICIENT ACID REFRACTORY CHOSEN FROM THE GROUP CONSISTING OF SILICA AND ALUMINA TO NEUTRALIZE THAT PORTION OF THE CAO AND MGO IN SAID STARTING ZIRCONIA SO AS TO LEAVE UNNEUTRALIZED BETWEEN APPROXIMATELY 8.23 TO 9.35 MOLE PERCENT TO CAO PLUS MGO THEREIN, AND FIRING SAID ZIRCONIA MIXTURE APPROXIMATELY IN THE TEMPERATURE RANGE 2400 DEGREES FAHFENHEIT TO 2900 DEGREES FAHRENHEIT IN AN OXIDIZING ATMOSPHERE, TO PROVIDE ZIRCONIA HAVING APPROXIMATELY 8 PERCENT TO 20 PERCENT THEREOF IN MONOCLINIC FORM.
References Cited (Backward Citations)
US2271369A
Cited
US2567592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |