Patent US2710247A successfully refreshed from Google Patents.
US2710247A
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US
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Treatment of phosphate rock
Assignee: Knowles Associates
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Filing: 1950-12-29
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Granted: 1955-06-07
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Expires: 1970-12-29
Abstract
No abstract record available.
Inventors
- 👤 Chester L Knowles
- 👤 Chelminski Roman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:26
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/22; C01B25/222; C01B25/223; C01B25/2235; C01B25/225
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
THE METHOD OF PRODUCING PHOSPHORIC ACID WHICH COMPRISES SUPPLYING SOLID PHOSPHATIC MATERIAL TO A REACTION ZONE, ALSO SUPPLYING THERETO SULFURIC ACID AND RECYCLED FINE SOLIDS SUSPENSION BEARING FINE PARTICLES OF CALCIUM SULFATE, AGITATING THE MIXTURE OF MATERIALS IN THE REACTION ZONE, PASSING THE RESULTING MIXTURE FROM THE REACTION ZONE TO A CLASSIFICATION ZONE, SEPARATING THE MIXTURE INTO A RELATIVELY DILUTE FINE-SOLIDS SUSPENSION, AND A MORE CONCENTRATED COARSE-SOLIDS SLURRY, RECYCLING SAID FINE-SOLIDS SUSPENSION TO THE REACTION ZONE, AND SEPARATING A LIQUID COMPONENT FROM THE COARSE-SOLIDS SLURRY.
Claim 2
Independent Claim
85 words
THE METHOD OF PRODUCING PHOSPHORIC ACID WHICH COMPRISES SUPPLYING SOLID PHOSPHATIC MATERIAL TO A REACTION ZONE, ALSO SUPPLYING THERETO SULFURIC ACID AND RECYCLED FINE SOLIDS SUSPENSION BEARING FINE PARTICLES OF CALCIUM SULFATE, AGITATING THE MIXTURE OF MATERIALS IN THE REACTION ZONE, PASSING THE RESULTING MIXTURE FROM THE REACTION ZONE TO A CLASSIFICATION ZONE, SEPARATING THE MIXTURE INTO A RELATIVELY DILUTE FINE-SOLIDS SUSPENSION, AND A MORE CONCENTRATED COARSE-SOLIDS SLURRY, RECYCLING SAID FINE-SOLIDS SUSPENSION TO THE REACTION ZONE, AND SEPARATING A LIQUID COMPONENT FROM THE COARSE-SOLIDS SLURRY.
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) | 1958-06-06 | 1958-12-06 | 1959-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-06 | 1962-12-06 | 1963-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-06 | 1966-12-06 | 1967-06-07 | $7700.00 | Window Closed / Lapsed |