US2883266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sodium silico fluoride and fluorine-free phosphoric acid
Assignee: JBS USA LLC
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Filing: 1956-06-29
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Granted: 1959-04-21
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Expires: 1976-06-29
Abstract
No abstract record available.
Inventors
- 👤 William A Hodges
- 👤 Joseph E Floyd
- 👤 Warren H Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:27
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/08; C01B33/10; C01B33/103; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/237; C01B25/2372; C01B25/2375
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
86 words
THE PROCESS FOR REMOVING FLUORINE FROM PHOSPHORIC ACID PRODUCED BY THE "WET" PROCESS, SAID FLUORIDE BEING IN AN AMOUNT OF BETWEEN 2.0 AND 2.5 PERCENT OF THE CRUDE PHOSPHORIC ACID, WHICH COMPRISES: ADDNG SODIUM HYDROXIDE AND SODIUM SILICATE TO CRUDE PHOSPHORIC ACID, WHEREBY TO PRECIPITATE SAID FLUORINE AS SODIUM SILICO FLUORIDE, SAID SODIUM HYDROXIDE BEING IN AN AMOUNT SUFFICIENT TO PRECIPITATE SUBSTANTIALLY ALL OF THE FLUORINE AND SAID SODIUM SILICATE BEING IN AN AMOUNT ABOUT 0.005 TO 0.025 POUND PER GALLON OF SAID CRUDE PHOSPHORIC ACID.
References Cited (Backward Citations)
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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) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |