Patent US2754191A successfully refreshed from Google Patents.
US2754191A
Expired / Lapsed
US
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Defluorination of phosphate rock
Assignee: SMITH DOUGLASS CO Inc
•
Filing: 1952-05-08
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Granted: 1956-07-10
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Expires: 1972-05-08
Abstract
No abstract record available.
Inventors
- 👤 Clinton A Hollingsworth
- 👤 John C Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:20
CPC Classifications
C; C05; C05B; C05B13/00; C05B13/02; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
THE METHOD OF DEFLUORINATING BY CALCINATION A NATURAL PHOSPHATIC MATERIAL WHICH COMPRISES PREPARING FROM SAID PHOSPHATIC MATERIAL A GRANULAR CALCINING CHARGE IN WHICH THE MOL RATIO EXPRESSED BY THE FORMULA
Claim 2
Independent Claim
30 words
THE METHOD OF DEFLUORINATING BY CALCINATION A NATURAL PHOSPHATIC MATERIAL WHICH COMPRISES PREPARING FROM SAID PHOSPHATIC MATERIAL A GRANULAR CALCINING CHARGE IN WHICH THE MOL RATIO EXPRESSED BY THE FORMULA
References Cited (Backward Citations)
US2360197A
Cited
GB453646A
Cited
US2155556A
Cited
US2337498A
Cited
US2446978A
Cited
US2442969A
Cited
US2556541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-10 | 1960-01-09 | 1960-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-10 | 1964-01-09 | 1964-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-10 | 1968-01-09 | 1968-07-10 | $7700.00 | Window Closed / Lapsed |