Patent US2772775A successfully refreshed from Google Patents.
US2772775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of sylvinite ore
Assignee: International Minerals and Chemical Corp
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Filing: 1953-03-02
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Granted: 1956-12-04
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Expires: 1973-03-02
Abstract
No abstract record available.
Inventors
- 👤 George E Atwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:46
CPC Classifications
B; B03; B03B; B03B1/00; B03B1/02; C; C01; C01D; C01D3/00; C01D3/04; C01D3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A PROCESS WHICH COMPRISES HEATING ORE COMPRISING SYLVINITE WHICH CONTAINS SLIME-PRODUCING CLAYS AT A TEMPERATUREE ABOVE ABOUT 180* C., BUT BELOW THE FUSION TEMPERATURE, UNTIL THE SLIME-PRODUCING MATERIALS ARE ALTERED TO HARD, BRITTLE, NONDISPERSIBLE MATERIALS, AND RECOVERING POTASSIUM-CONTAINING COMPOUNDS FROM THE RESULTING HEATTREATED ORE.
Claim 2
Dependent Claim
44 words
A PROCESS WHICH COMPRISES HEATING ORE COMPRISING SYLVINITE WHICH CONTAINS SLIME-PRODUCING CLAYS AT A TEMPERATUREE ABOVE ABOUT 180* C., BUT BELOW THE FUSION TEMPERATURE, UNTIL THE SLIME-PRODUCING MATERIALS ARE ALTERED TO HARD, BRITTLE, NONDISPERSIBLE MATERIALS, AND RECOVERING POTASSIUM-CONTAINING COMPOUNDS FROM THE RESULTING HEATTREATED ORE.
References Cited (Backward Citations)
US734240A
Cited
US1422026A
Cited
US1679857A
Cited
US2197865A
Cited
US2387561A
Cited
US2593431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |