Patent US3244228A successfully refreshed from Google Patents.
Patent US2573295A successfully refreshed from Google Patents.
Patent US2945745A successfully refreshed from Google Patents.
US2945745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of fluorine compounds
Assignee: International Minerals and Chemical Corp
•
Filing: 1957-12-30
•
Granted: 1960-07-19
•
Expires: 1977-12-30
Abstract
No abstract record available.
Inventors
- 👤 David H Reeve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:44
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/08; C01B33/10; C01B33/103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
IN A PROCESS FOR PREPARING SUBSTANTIALLY PHOSPHORUSFREE FLUORINE MATERIAL FROM AN AQUEOUS FLUOSILICIC ACID SOLUTION CONTAINING PHOSPHOROUS IN SOLUTION, THE STEPS COMPRISING ADDING AMMONIA TO SAID FLUOSILICIC ACID SOLUTION TO OBTAIN A PH WITHIN THE RANGE OF FROM 2.5 TO 7.0 AND BELOW THE PH WHERE A SUBSTANTIAL AMOUNT OF AMMONIUM FLUORIDE IS FORMED, TO EFFECT THE FORMATION OF AMMONIUM FLUOROSILICATE, AND SEPARATING AMMONIUM FLUOSILICATE CRYSTALS FROM THE AMMONIATED SOLUTION.
Claim 2
Dependent Claim
70 words
IN A PROCESS FOR PREPARING SUBSTANTIALLY PHOSPHORUSFREE FLUORINE MATERIAL FROM AN AQUEOUS FLUOSILICIC ACID SOLUTION CONTAINING PHOSPHOROUS IN SOLUTION, THE STEPS COMPRISING ADDING AMMONIA TO SAID FLUOSILICIC ACID SOLUTION TO OBTAIN A PH WITHIN THE RANGE OF FROM 2.5 TO 7.0 AND BELOW THE PH WHERE A SUBSTANTIAL AMOUNT OF AMMONIUM FLUORIDE IS FORMED, TO EFFECT THE FORMATION OF AMMONIUM FLUOROSILICATE, AND SEPARATING AMMONIUM FLUOSILICATE CRYSTALS FROM THE AMMONIATED 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) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |