Patent US2535526A successfully refreshed from Google Patents.
US2535526A
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Stabilized zirconia and method for producing same
Assignee: Saint Gobain Abrasives Inc
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Filing: 1950-01-19
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Granted: 1950-12-26
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Expires: 1970-01-19
Abstract
No abstract record available.
Inventors
- 👤 Archibald H Ballard
- 👤 Douglas W Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:09
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/60; F04D29/605; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; F04B; F04B43/00; F04B43/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROCESS FOR THE MANUFACTURE OF STABILIZED ZIRCONIA COMPRISING FUSING IN AN ELECTRI ARC FURNACE AN ORE CONTAINING ZRO2 TOGETHER WITH A QUANTITY OF CARBON WHICH IS TWO-THIRDS OF THE THEORETICAL QUANTITY OF CARBON REQUIRED COMPLETELY TO REDUCE THE SILICA PLUS 100% OF THE THEORETICAL QUANTITY REQUIRED TO REDUCE ALL THE OTHER OXIDES (EXCEPT ZIRCONIA) TO METAL WITH UP TO 40% EXCESS OVER THE TOTAL OF THESE QUANTITIES AND TOGETHER WITH AN AMOUNT OF IRON THAT IS ENOUGH TO MAKE WITH TWO-THIRDS OF THE SILICON A FERROSILILCON HAVING AN IRON CONTENT OF 75% TO 85% MINUS THE AMOUNT OF IRON OBTAINED BY THE REDUCTION OF THE IRON OXIDE IN THE ORE TO IRON, AND TOGETHER WITH A STABILIZING AGENT CONSISTING OF CALCIUM OXIDE, THE QUANTITY OF STABILIZING AGENT BEING FROM 3% TO 6% OF THE AMOUNT OF ZRO2 IN THE ORE.
Claim 2
Dependent Claim
141 words
A PROCESS FOR THE MANUFACTURE OF STABILIZED ZIRCONIA COMPRISING FUSING IN AN ELECTRI ARC FURNACE AN ORE CONTAINING ZRO2 TOGETHER WITH A QUANTITY OF CARBON WHICH IS TWO-THIRDS OF THE THEORETICAL QUANTITY OF CARBON REQUIRED COMPLETELY TO REDUCE THE SILICA PLUS 100% OF THE THEORETICAL QUANTITY REQUIRED TO REDUCE ALL THE OTHER OXIDES (EXCEPT ZIRCONIA) TO METAL WITH UP TO 40% EXCESS OVER THE TOTAL OF THESE QUANTITIES AND TOGETHER WITH AN AMOUNT OF IRON THAT IS ENOUGH TO MAKE WITH TWO-THIRDS OF THE SILICON A FERROSILILCON HAVING AN IRON CONTENT OF 75% TO 85% MINUS THE AMOUNT OF IRON OBTAINED BY THE REDUCTION OF THE IRON OXIDE IN THE ORE TO IRON, AND TOGETHER WITH A STABILIZING AGENT CONSISTING OF CALCIUM OXIDE, THE QUANTITY OF STABILIZING AGENT BEING FROM 3% TO 6% OF THE AMOUNT OF ZRO2 IN THE ORE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |