Patent US3333924A successfully refreshed from Google Patents.
US3333924A
Expired / Lapsed
US
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Recovery of acids
Assignee: Hazen Research Inc
•
Filing: 1964-01-10
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Granted: 1967-08-01
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Expires: 1984-01-10
Abstract
No abstract record available.
Inventors
- 👤 Wayne C Hazen
- 👤 Angus V Henrickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:39
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/90; C01B25/00; C01B25/16; C01B25/18; C01B25/234
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN A PROCESS FOR THE RECOVERY OF AN ACID SELCTED FROM THE GROUP CONSISTING OF SULFURIC AND PHOSPHORIC ACIDS FROM SOLUTIONS THEREOF COMPRISING THE STEPS OF: EXTRACTING SAID ACID FROM SAID SOLUTION WITH A SUBSTANTIALLY WATER IMMISCIBLE ORGANIC EXTRACTANT MEDIUM, AND STRIPPING SAID ACID FROM SAID EXTRACTANT WITH A STRIPPING AGENT; THE IMPROVMENT IN WHICH SAID STRIPPING COMPRISES: USING A STRIPPING AGENT COMPRISING WATER CONTAINING SULFUR DIOXIDE IN AT LEAST AN AMOUNT SUBSTANTIALLY APPROACHING THAT REQUIRED TO SATURATE THE WATER AT ABOUT 50*C.
Claim 2
Dependent Claim
83 words
IN A PROCESS FOR THE RECOVERY OF AN ACID SELCTED FROM THE GROUP CONSISTING OF SULFURIC AND PHOSPHORIC ACIDS FROM SOLUTIONS THEREOF COMPRISING THE STEPS OF: EXTRACTING SAID ACID FROM SAID SOLUTION WITH A SUBSTANTIALLY WATER IMMISCIBLE ORGANIC EXTRACTANT MEDIUM, AND STRIPPING SAID ACID FROM SAID EXTRACTANT WITH A STRIPPING AGENT; THE IMPROVMENT IN WHICH SAID STRIPPING COMPRISES: USING A STRIPPING AGENT COMPRISING WATER CONTAINING SULFUR DIOXIDE IN AT LEAST AN AMOUNT SUBSTANTIALLY APPROACHING THAT REQUIRED TO SATURATE THE WATER AT ABOUT 50*C.
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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) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |