Patent US2855274A successfully refreshed from Google Patents.
US2855274A
Expired / Lapsed
US
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Treatments of silico-magnesia minerals and in furnaces for carrying out such treatments
Assignee: Centre National de la Recherche Scientifique
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Filing: 1954-08-30
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Granted: 1958-10-07
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Expires: 1974-08-30
Abstract
No abstract record available.
Inventors
- 👤 Caillere Simonne Anne Marie
- 👤 Foex Marc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:22
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A METHOD FOR THE TREATMENT OF A SILICA AND FORSTERITE MINERAL CONTAINING A GREATER PROPORTION OF SILICA THAN FORSTERITE WHICH COMPRISES MIXING SAID MINERAL WITH A CARBONACEOUS PRODUCT CAPABLE OF REDUCING METALLIC OXIDES, PLACING THE MIXTURE THUS OBTAINED IN A ROTARY FURNACE HAVING A CENTRAL OPENING AND ROTATING SAID FURNACE WHEREBY SAID MIXTURE IS FORCED AGAINST THE INNER WALL OF SAID FURNACE WHILE LEAVING AN EMPTY ZONE IN SAID FURNACE ABOUT THE AXIS OF ROTATION THEREOF, SAID EMPTY ZONE CONTAINING SAID CENTRAL OPENING OF THE FURNACE AND SAID
Claim 2
Independent Claim
88 words
A METHOD FOR THE TREATMENT OF A SILICA AND FORSTERITE MINERAL CONTAINING A GREATER PROPORTION OF SILICA THAN FORSTERITE WHICH COMPRISES MIXING SAID MINERAL WITH A CARBONACEOUS PRODUCT CAPABLE OF REDUCING METALLIC OXIDES, PLACING THE MIXTURE THUS OBTAINED IN A ROTARY FURNACE HAVING A CENTRAL OPENING AND ROTATING SAID FURNACE WHEREBY SAID MIXTURE IS FORCED AGAINST THE INNER WALL OF SAID FURNACE WHILE LEAVING AN EMPTY ZONE IN SAID FURNACE ABOUT THE AXIS OF ROTATION THEREOF, SAID EMPTY ZONE CONTAINING SAID CENTRAL OPENING OF THE FURNACE AND SAID
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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) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |