Patent US2780522A successfully refreshed from Google Patents.
US2780522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of fluorine compounds
Assignee: International Minerals and Chemical Corp
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Filing: 1953-12-17
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Granted: 1957-02-05
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Expires: 1973-12-17
Abstract
No abstract record available.
Inventors
- 👤 Gunter H Gloss
- 👤 John H Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:30
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/16; C01C1/162; C01B; C01B33/00; C01B33/08; C01B33/10; C01B33/103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A PROCESS FOR THE PRODUCTION OF FLUORINE-CONTAINING COMPOUNDS WHICH COMPRISES ADDING AN AQUEOUS FLUOSILICIC ACID-CONTAINING SOLUTION TO SUFFICIENT AQUEOUS AMMONIA TO MAINTAIN A PH ABOVE 7.5 IN THE RESULTING REACTION MIXTURE, WHILE MAINTAINING THE TEMPERATURE OF SAID MIXTURE BETWEEN ABOUT THE FREEZING POINT AND ABOUT 40* C., AND SEPARATING THE RESULTING GRANULAR SILICA WHICH PRECIPITATES FROM THE RESULTING AMMONIUM FLUORIDE SOLUTION.
Claim 2
Dependent Claim
61 words
A PROCESS FOR THE PRODUCTION OF FLUORINE-CONTAINING COMPOUNDS WHICH COMPRISES ADDING AN AQUEOUS FLUOSILICIC ACID-CONTAINING SOLUTION TO SUFFICIENT AQUEOUS AMMONIA TO MAINTAIN A PH ABOVE 7.5 IN THE RESULTING REACTION MIXTURE, WHILE MAINTAINING THE TEMPERATURE OF SAID MIXTURE BETWEEN ABOUT THE FREEZING POINT AND ABOUT 40* C., AND SEPARATING THE RESULTING GRANULAR SILICA WHICH PRECIPITATES FROM THE RESULTING AMMONIUM FLUORIDE SOLUTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |