US2753253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of phosphate rock
Assignee: SMITH DOUGLASS CO Inc
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Filing: 1952-10-15
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Granted: 1956-07-03
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Expires: 1972-10-15
Abstract
No abstract record available.
Inventors
- 👤 Clinton A Hollingsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:54
CPC Classifications
C; C05; C05B; C05B13/00; C05B13/02; C01; C01B; C01B7/00; C01B7/19; C01B7/191; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
THE METHOD OF INCREASING THE FLUORINE CONTENT OF A FLUORINE-CONTAINING PHOSPHATIC MATERIAL AND RECOVERING FLUORINE THEREFROM IN A SUBSEQUENT DEFLUORINATING CALCINATION WHICH COMPRISES SUBJECTING A PARTIALLY-DEFLUORINATED FLUORINE-CONTAINING PHOSPHATIC MATERIAL TO DEFLUORINATION BY CALCINATION WITH CONCOMITANT FORMATION OF AN EXHAUST GAS CONTAINING A GASEOUS FLUORINE COMPOUND VOLATILIZED IN THE COURSE OF CALCINATION, PASSING THE EXHAUST GAS INTO CONTACT WITH THE FLUORINE-CONTAINING PHOSPHATIC MATERIAL WHOSE FLUORINE CONTENT IS TO BE INCREASED AND WHICH CONTAINS A CONSTITUENT CAPABLE OF AND REACTING WITH THE GASEOUS FLUORINE COMPOUND IN SAID EXHAUST GAS TO FORM A SOLID FLUORINE COMPOUND WHICH IS RETAINED WITH SAID PHOSPHATIC MATERIAL WHOSE FLUORINE CONTENT IS TO BE INCREASED, CONTINUING THE CONTACT OF SAID EXHAUST GAS WITH SAID LASTMENTIONED PHOSPHATIC MATERIAL UNTIL THE FLUORINE CONTENT THEREOF IS SUBSTANTIALLY INCREASED, SUBSEQUENTLY SUBJECTING THE RESULTING PHOSPHATIC MATERIAL OF INCREASED FLUORINE CONTENT TO A DEFLUORINATING CALCINATION WITH CONCOMITANT FORMATION OF AN EXHAUST GAS CONTAINING A FLUORINE COMPOUND, AND RECOVERING SAID LAST-MENTIONED FLUORINE COMPOUND FROM THE EXHAUST GAS OF SAID LAST-MENTIONED DEFLUORINATING CALCINATION.
Claim 2
Independent Claim
167 words
THE METHOD OF INCREASING THE FLUORINE CONTENT OF A FLUORINE-CONTAINING PHOSPHATIC MATERIAL AND RECOVERING FLUORINE THEREFROM IN A SUBSEQUENT DEFLUORINATING CALCINATION WHICH COMPRISES SUBJECTING A PARTIALLY-DEFLUORINATED FLUORINE-CONTAINING PHOSPHATIC MATERIAL TO DEFLUORINATION BY CALCINATION WITH CONCOMITANT FORMATION OF AN EXHAUST GAS CONTAINING A GASEOUS FLUORINE COMPOUND VOLATILIZED IN THE COURSE OF CALCINATION, PASSING THE EXHAUST GAS INTO CONTACT WITH THE FLUORINE-CONTAINING PHOSPHATIC MATERIAL WHOSE FLUORINE CONTENT IS TO BE INCREASED AND WHICH CONTAINS A CONSTITUENT CAPABLE OF AND REACTING WITH THE GASEOUS FLUORINE COMPOUND IN SAID EXHAUST GAS TO FORM A SOLID FLUORINE COMPOUND WHICH IS RETAINED WITH SAID PHOSPHATIC MATERIAL WHOSE FLUORINE CONTENT IS TO BE INCREASED, CONTINUING THE CONTACT OF SAID EXHAUST GAS WITH SAID LASTMENTIONED PHOSPHATIC MATERIAL UNTIL THE FLUORINE CONTENT THEREOF IS SUBSTANTIALLY INCREASED, SUBSEQUENTLY SUBJECTING THE RESULTING PHOSPHATIC MATERIAL OF INCREASED FLUORINE CONTENT TO A DEFLUORINATING CALCINATION WITH CONCOMITANT FORMATION OF AN EXHAUST GAS CONTAINING A FLUORINE COMPOUND, AND RECOVERING SAID LAST-MENTIONED FLUORINE COMPOUND FROM THE EXHAUST GAS OF SAID LAST-MENTIONED DEFLUORINATING CALCINATION.
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) | 1959-07-03 | 1960-01-02 | 1960-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-03 | 1964-01-02 | 1964-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-03 | 1968-01-02 | 1968-07-03 | $7700.00 | Window Closed / Lapsed |