US2816818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of ammonium fluoride
Assignee: International Minerals and Chemical Corp
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Filing: 1954-12-31
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Granted: 1957-12-17
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Expires: 1974-12-31
Abstract
No abstract record available.
Inventors
- 👤 John H Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:59
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/16; C01C1/162
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
IN A PROCESS FOR THE MANUFACTURE OF SUBSTANTIALLU PHOSPHATE FREE AMMONIUM FLOURIDE FROM PHOSPHATE CONTAMINATED SOULTION PREPARD BY ABSORPTION OF FLOURINEBEARING GASES, INCLUDING SIF4, IN AN AQUEOUS MEDIUM, THE STEPS COMPRISING REACTING THE PHOSPHATE CONTAINING SOLUTION WITH AMMONIA UNDER CONDITIONS TO MAINTAIN AN ALKALINE PH OF BETWEEN ABOUT 7 AND ABOUT 9 TO PRECIPITATE SILICA, SEPARATING THE AMMONIA UNDER CONDITION TO MAINTAIN AN SOLIDS-FREE LIQUOR WITH AMMONIA UNDER CONDITIONS TO MAINTAIN A FREE AMMONIA CONCENTRATION GREATER THAN ABOUT 1 % PRECIPITATE AMMONIUM PHOSPHATE, REMOVING THE PRECIPITATED AMMONIUM PHOSPHATE FROM THE REACTED MIXTURE AND RECOVERING AMMONIUM FLOURIDE FROM THE RESULTANT LIQUOR.
References Cited (Backward Citations)
US1235552A
Cited
US2141773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |