US3017247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of phosphoric acid
Assignee: Phillips Petroleum Co
•
Filing: 1957-02-11
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Granted: 1962-01-16
•
Expires: 1977-02-11
Abstract
No abstract record available.
Inventors
- 👤 Edward E Huxley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:39
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
IN A CONTINUOUS PROCESS FOR THE PRODUCTION OF PHOSPHORIC ACID, INCLUDING THE STEPS OF INITIALLY REACTING PHOSPHATIC MATERIAL WITH RECYCLE PHOSPHORIC ACID, REACTING THE RESULTING MASS WITH CONCENTRATED SULFURIC ACID TO OBTAIN A SLURRY COMPRISING DILUTE PHOSPHORIC ACID AND GYPSUM, FILTERING SAID SLURRY IN A FILTRATION ZONE TO OBTAIN A FIRST FILTRATE COMPRISING DILUTE PHOSPHORIC ACID, WASHING SAID GYPSUM REMAINING IN SAID FILTRATION ZONE WITH A WASH COMPRISING A FIRST PORTION OF WATER TO OBTAIN A SECOND FILTRATE COMPRISING DILUTE PHOSPHORIC ACID, CONDUCTING SAID TO A SECOND ZONE, CONDUCTING A SECOND PORTION OF WATER DIRECTLY TO SAID SECOND ZONE, CONDUCTING A PORTION OF SAID FIRST FILTRATE FROM SAID FIRST ZONE TO SAID SECOND ZONE, AND CONTINUOUSLY WITHDRAWING THE CONTENTS FROM SAID SECOND ZONE AND USING THE SAME AS SAID RECYCLE PHOSPHORIC ACID, THE IMPROVEMENT COMPRISING SUPPLYING SAID FIRST AND SECOND PORTIONS OF WATER FROM A COMMON SOURCE, CONDUCTING
Claim 2
Dependent Claim
148 words
IN A CONTINUOUS PROCESS FOR THE PRODUCTION OF PHOSPHORIC ACID, INCLUDING THE STEPS OF INITIALLY REACTING PHOSPHATIC MATERIAL WITH RECYCLE PHOSPHORIC ACID, REACTING THE RESULTING MASS WITH CONCENTRATED SULFURIC ACID TO OBTAIN A SLURRY COMPRISING DILUTE PHOSPHORIC ACID AND GYPSUM, FILTERING SAID SLURRY IN A FILTRATION ZONE TO OBTAIN A FIRST FILTRATE COMPRISING DILUTE PHOSPHORIC ACID, WASHING SAID GYPSUM REMAINING IN SAID FILTRATION ZONE WITH A WASH COMPRISING A FIRST PORTION OF WATER TO OBTAIN A SECOND FILTRATE COMPRISING DILUTE PHOSPHORIC ACID, CONDUCTING SAID TO A SECOND ZONE, CONDUCTING A SECOND PORTION OF WATER DIRECTLY TO SAID SECOND ZONE, CONDUCTING A PORTION OF SAID FIRST FILTRATE FROM SAID FIRST ZONE TO SAID SECOND ZONE, AND CONTINUOUSLY WITHDRAWING THE CONTENTS FROM SAID SECOND ZONE AND USING THE SAME AS SAID RECYCLE PHOSPHORIC ACID, THE IMPROVEMENT COMPRISING SUPPLYING SAID FIRST AND SECOND PORTIONS OF WATER FROM A COMMON SOURCE, CONDUCTING
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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) | 1965-01-15 | 1965-07-17 | 1966-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-15 | 1969-07-17 | 1970-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-15 | 1973-07-17 | 1974-01-16 | $7700.00 | Window Closed / Lapsed |