US3749595A
Expired / Lapsed
US
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Method for making anhydrous chromium sesquioxide by reducing a hexavalent chromium compound
Assignee: Ceraver SA
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Filing: 1971-05-04
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Granted: 1973-07-31
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Expires: 1991-05-04
Abstract
Abstract A METHOD OF MAKING ANHYDROUS CHROMIUM SESQUIOXIDE BY REDUCING A HEXAVALENT CHROMIUM COMPOUND NOT DECOMPOSABLE AT A TEMPERATURE OF LESS THAN 300*C., COMPRISING SUBJECTING SAID HEXAVALENT CHROMIUM COMPOUND TO HEATING IN A NON-REDUCING ATMOSPHERE BETWEEN ABOUT 197 AND 280*C., THEN HEATING IN A REDUCING ATMOSPHERE BETWEEN ABOUT 250 AND 350*C.
Inventors
- 👤 J Foucry
- 👤 A Auriol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:25
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; C; C01; C01G; C01G37/00; C01G37/02; C01P; C01P2006/00; C01P2006/80; C01P2006/82; C01P2006/90
Claims Analysis
Total Claims: 0
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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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |