Patent US3192014A successfully refreshed from Google Patents.
US3192014A
Expired / Lapsed
US
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Manufacture of phosphoric acid
Assignee: Dorr Oliver Inc
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Filing: 1962-04-20
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Granted: 1965-06-29
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Expires: 1982-04-20
Abstract
No abstract record available.
Inventors
- 👤 David W Leyshon
- 👤 William A Lutz
- 👤 Robert H Oliver
- 👤 Hans H Oltmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:33
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN A PROCESS FOR THE MANUFACTURE OF PHOSPHORIC ACID WHICH COMPRISES REACTING SULFURIC ACID WITH PHOSPHATE ROCK SO AS TO FORM A REACTION SLURRY OF GYPSUM AND AQUEOUS PHOSPHORIC ACID, AND SEPARATING SAID AQUEOUS PHOSPHORIC ACID FROM SAID GYPSUM BY FILTRATION, THE IMPROVEMENT WHICH COMPRISES SUPPLYING TO THE REACTION SLURRY AT LEAST WHILE SAID REACTION IS IN PROGRESS AND WHILE GYPSUM CRYSTALS ARE BEING FORMED A FILTERABILITY IMPROVING ADDITIVE SELECTED FROM THE GROUP CONSISTING OF ALKYL BENZENE SULPHONIC ACIDS, HAVING AN ALKYL GROUP FROM NINE TO TWELVE CARBON ATOMS, ISOPROPYL NAPHTHALENE SULPHONIC ACID AND THE ALKALI METAL SALTS OF SAID ACIDS IN A PROPORTION RANGING FROM ABOUT 0.1 TO 2.0 POUNDS OF SAID ALKYL BENZENE SULPHONIC ACID PER TON OF PHOSPHATE ROCK AND ABOUT 0.1 TO 3.2 POUNDS OF SAID ISOPROPYL NAPHTHALENE SULFONIC ACID PER TON OF PHOSPHATE ROCK.
Claim 2
Dependent Claim
139 words
IN A PROCESS FOR THE MANUFACTURE OF PHOSPHORIC ACID WHICH COMPRISES REACTING SULFURIC ACID WITH PHOSPHATE ROCK SO AS TO FORM A REACTION SLURRY OF GYPSUM AND AQUEOUS PHOSPHORIC ACID, AND SEPARATING SAID AQUEOUS PHOSPHORIC ACID FROM SAID GYPSUM BY FILTRATION, THE IMPROVEMENT WHICH COMPRISES SUPPLYING TO THE REACTION SLURRY AT LEAST WHILE SAID REACTION IS IN PROGRESS AND WHILE GYPSUM CRYSTALS ARE BEING FORMED A FILTERABILITY IMPROVING ADDITIVE SELECTED FROM THE GROUP CONSISTING OF ALKYL BENZENE SULPHONIC ACIDS, HAVING AN ALKYL GROUP FROM NINE TO TWELVE CARBON ATOMS, ISOPROPYL NAPHTHALENE SULPHONIC ACID AND THE ALKALI METAL SALTS OF SAID ACIDS IN A PROPORTION RANGING FROM ABOUT 0.1 TO 2.0 POUNDS OF SAID ALKYL BENZENE SULPHONIC ACID PER TON OF PHOSPHATE ROCK AND ABOUT 0.1 TO 3.2 POUNDS OF SAID ISOPROPYL NAPHTHALENE SULFONIC ACID PER TON OF PHOSPHATE ROCK.
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) | 1968-06-28 | 1968-12-28 | 1969-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-28 | 1972-12-28 | 1973-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-28 | 1976-12-28 | 1977-06-29 | $7700.00 | Window Closed / Lapsed |