Patent US2963358A successfully refreshed from Google Patents.
US2963358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of granular fertilizers
Assignee: Armour and Co
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Filing: 1955-11-17
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Granted: 1960-12-06
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Expires: 1975-11-17
Abstract
No abstract record available.
Inventors
- 👤 White Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:30
CPC Classifications
C; C05; C05B; C05B1/00; C05B1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A PROCES FOR THE PRODUCTION OF A PLURALITY OF GRADES OF GRANULAR FERTILIZER, COMPRISING TREATING PHOSPHATE ROCK WITH SULFURIC ACID TO PRODUCE PHOSPHORIC ACID AND ROCK CAKE, DRAWING OFF PHOSPHORIC ACID FROM THE ROCK CAKE, EMPLOYING PHOSPHORIC ACID DRAWN OFF FROM SAID ROCK CAKE IN THE PRODUCTION OF A HIGH GRADE FERTILIZER, MIXING THE UNWASHED ROCK CAKE WITH A DILUTE ACID SELECTED FROM THE GROUP CONSISTING OF SULFRIC, PHOSPHORIC, AND MIXTURES THEREOF, ADDING PHOSPHATE ROCK DUST AND SUPERPHOSPHATE TO THE MIXTURE, AND TUMBLING THE RESULTANT MIXTURE IN A DRYING ATMOSPHERE AND WITHIN A ROTARY CONTAINER TO PRODUCE A LOWER GRADE GANULAR PRODUCT.
Claim 2
Dependent Claim
102 words
A PROCES FOR THE PRODUCTION OF A PLURALITY OF GRADES OF GRANULAR FERTILIZER, COMPRISING TREATING PHOSPHATE ROCK WITH SULFURIC ACID TO PRODUCE PHOSPHORIC ACID AND ROCK CAKE, DRAWING OFF PHOSPHORIC ACID FROM THE ROCK CAKE, EMPLOYING PHOSPHORIC ACID DRAWN OFF FROM SAID ROCK CAKE IN THE PRODUCTION OF A HIGH GRADE FERTILIZER, MIXING THE UNWASHED ROCK CAKE WITH A DILUTE ACID SELECTED FROM THE GROUP CONSISTING OF SULFRIC, PHOSPHORIC, AND MIXTURES THEREOF, ADDING PHOSPHATE ROCK DUST AND SUPERPHOSPHATE TO THE MIXTURE, AND TUMBLING THE RESULTANT MIXTURE IN A DRYING ATMOSPHERE AND WITHIN A ROTARY CONTAINER TO PRODUCE A LOWER GRADE GANULAR PRODUCT.
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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) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |