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Patent US2600813A successfully refreshed from Google Patents.
US2600813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of phosphoric acid
Assignee: International Minerals and Chemical Corp
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Filing: 1948-11-29
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Granted: 1952-06-17
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Expires: 1968-11-29
Abstract
No abstract record available.
Inventors
- 👤 Calvin M Tidwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:16
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A PROCESS FOR PRODUCING SUBSTANTIALLY IRONFREE PHOSPHORIC ACID WHICH COMPRISES REACTING AT ABOVE 100* C. A COMPOSITION CONTAINING ESSESTIALLY FERROPHOSPHORUS WITH SULFURIC ACID WHICH CONTAINS FREE SULFUR TRIOXIDE IN AN AMOUNT SUFFICIENT TO REMOVE FROM THE REACTION MIXTURE THE WATER PRODUCED THEREIN AND SEPARATING THE PRECIPITATED SOLIDS FROM THE RESULTANT REACTION MIXTURE AND REMOVING EXCESS SULFURIC ACID AND SULFUR TRIOXIDE FROM THE RESULTANT ACID MIXTURE.
Claim 2
Dependent Claim
65 words
A PROCESS FOR PRODUCING SUBSTANTIALLY IRONFREE PHOSPHORIC ACID WHICH COMPRISES REACTING AT ABOVE 100* C. A COMPOSITION CONTAINING ESSESTIALLY FERROPHOSPHORUS WITH SULFURIC ACID WHICH CONTAINS FREE SULFUR TRIOXIDE IN AN AMOUNT SUFFICIENT TO REMOVE FROM THE REACTION MIXTURE THE WATER PRODUCED THEREIN AND SEPARATING THE PRECIPITATED SOLIDS FROM THE RESULTANT REACTION MIXTURE AND REMOVING EXCESS SULFURIC ACID AND SULFUR TRIOXIDE FROM THE RESULTANT ACID MIXTURE.
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) | 1955-06-17 | 1955-12-17 | 1956-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-17 | 1959-12-17 | 1960-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-17 | 1963-12-17 | 1964-06-17 | $7700.00 | Window Closed / Lapsed |