Patent US2885265A successfully refreshed from Google Patents.
US2885265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing substantially pure orthophosphoric acid
Assignee: Horizons Inc
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Filing: 1955-06-21
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Granted: 1959-05-05
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Expires: 1975-06-21
Abstract
No abstract record available.
Inventors
- 👤 George L Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:31
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/28; C01B25/18; C01B25/22; C01B25/234; C01B25/38; C01B25/40; C01B25/405
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A PROCESS FOR PRODUCING SUBSTANTIALLY PRUE ORTHOPHOSPHORIC ACID WHICH COMPRISES: PRODUCING A FIRST AQUE OUS SLURRY OF GYPSUM AND ORTHOPHOSPHORIC ACID AND SULFURIC ACID BY REACTING AN IMPURE PHOSPHATE-CONTAINING MATERIAL WITH AN AMOUNT OF SULFURIC ACID SLIGHTLY IN EXCESS OF THE STOICHIOMETRIC AMOUNT REQUIRED TO CONVERT THE PHOSPHATE CONTENT OF THE IMPURE MATERIAL TO ORTHOPHOS PHORIC ACID; PREPAREING A SECOND AQUEOUS SLURRY OF GYPSUM AND ORTHOPHOSPHORIC ACID BY SEPARATLY REACTING AN ADDITIONAL AMOUNT OF IMPURE PHOSPHATE-CONTAINING MATERIAL WITH AN AMOUNT OF SULFURIC SLIGHTLY LESS THAN THE STOICHOMETRIC AMOUNT REQUIRED TO CONVERT THE PHOSPHATE CONTENT TO ORTHOPHOSPHORIC ACID, WHEREBY A SMALL AMOUNT OF ALKALINE EARTH REMAINS UNREACTED WITH SAID ADDED ACID; EXTRACTING THE FIRST SLURRY BY A LIQUID/LIQUID COUNTER-CUR, RENT EXTRACTION OF THE SLURRY WITH A WATER IMMISCIBLE OXYGENATED HYDROCARBON EXTRACTION LIQUID SELECTED FROM LIQUID OXYGENATED HYDROCARBONS HAVING AT LEAST THREE AND NOT MORE THAN EITHT CARBONS IN THE CHAIN CARRYING THE OXYGEN, GROUP, WHEREBY THE EXTRACTION LIQUID REMOVES THE ORTHOPHOSPHORIC ACID AND SULFURIC ACID FROM THE SLURRY; PASSING THE RESULTING LIQUID PRODUCT CONTAINING ORTHOPHOSPHORIC ACID AND SULFURIC ACID COUNTER-CURRENT TO THE
Claim 2
Dependent Claim
181 words
A PROCESS FOR PRODUCING SUBSTANTIALLY PRUE ORTHOPHOSPHORIC ACID WHICH COMPRISES: PRODUCING A FIRST AQUE OUS SLURRY OF GYPSUM AND ORTHOPHOSPHORIC ACID AND SULFURIC ACID BY REACTING AN IMPURE PHOSPHATE-CONTAINING MATERIAL WITH AN AMOUNT OF SULFURIC ACID SLIGHTLY IN EXCESS OF THE STOICHIOMETRIC AMOUNT REQUIRED TO CONVERT THE PHOSPHATE CONTENT OF THE IMPURE MATERIAL TO ORTHOPHOS PHORIC ACID; PREPAREING A SECOND AQUEOUS SLURRY OF GYPSUM AND ORTHOPHOSPHORIC ACID BY SEPARATLY REACTING AN ADDITIONAL AMOUNT OF IMPURE PHOSPHATE-CONTAINING MATERIAL WITH AN AMOUNT OF SULFURIC SLIGHTLY LESS THAN THE STOICHOMETRIC AMOUNT REQUIRED TO CONVERT THE PHOSPHATE CONTENT TO ORTHOPHOSPHORIC ACID, WHEREBY A SMALL AMOUNT OF ALKALINE EARTH REMAINS UNREACTED WITH SAID ADDED ACID; EXTRACTING THE FIRST SLURRY BY A LIQUID/LIQUID COUNTER-CUR, RENT EXTRACTION OF THE SLURRY WITH A WATER IMMISCIBLE OXYGENATED HYDROCARBON EXTRACTION LIQUID SELECTED FROM LIQUID OXYGENATED HYDROCARBONS HAVING AT LEAST THREE AND NOT MORE THAN EITHT CARBONS IN THE CHAIN CARRYING THE OXYGEN, GROUP, WHEREBY THE EXTRACTION LIQUID REMOVES THE ORTHOPHOSPHORIC ACID AND SULFURIC ACID FROM THE SLURRY; PASSING THE RESULTING LIQUID PRODUCT CONTAINING ORTHOPHOSPHORIC ACID AND SULFURIC ACID COUNTER-CURRENT TO THE
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) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |