Patent US5996018A successfully refreshed from Google Patents.
US2967091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon coating of phosphate nodules
Assignee: FMC Corp
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Filing: 1957-07-18
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Granted: 1961-01-03
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Expires: 1977-07-18
Abstract
No abstract record available.
Inventors
- 👤 Robertson James Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:35
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/003; C01B25/01; C01B25/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
61 words
A PROCESS FOR THE PRODUCTION OF A FREE FLOWING, NONSINTERING PHOSPHATE BURDEN IN AN ELECTRIC PHOSPHORUS FURNACE, THE STEPS COMPRISING COATING SUBSTANTIALLY ALL OF THE PHOSPHATE PARTICLES OF THE BURDEN WITH ABOUT 0.1 TO ABOUT 2.0% FINELY DIVIDED CARBON BASED ON THE WEIGHT OF THE PARTICLES, MIXING THE COATED PARTICLES WITH SILICA AND COKE AND PASSING THE BURDEN INTO THE FURNACE.
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) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |