Patent US3672490A successfully refreshed from Google Patents.
US2901490A
Expired / Lapsed
US
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Regeneration of degraded anthraquinone working solutions for the production of hydrogen peroxide
Assignee: EIDP Inc
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Filing: 1957-01-29
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Granted: 1959-08-25
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Expires: 1977-01-29
Abstract
No abstract record available.
Inventors
- 👤 Jerome W Sprauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:48
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/022; C01B15/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
THE METHOD COMPRISING SUBJECTING A SOLUTION OF ANTHRAQUINONE DEGRADATION PRODUCTS TO THE REDUCING ACTION OF A METAL AND AN ACID, SAID METAL BEING FROM THE GROUP CONSISTING OF ZINC AND MAGNESIUM, AND SAID ACID BEING ONE WHICH IS MISCIBLE WITH SAID SOLUTION AND WHICH TOGETHER WITH SAID METAL WILL REDUCE THE ANTHRAQUINONE FROM WHICH SAID DEGRADATION PRODUCTS WERE DERIVED TO THE ANTHRAHYDROQUINONE, SAID ANTHRAQUINONE DEGRADATION PRODUCTS HAVING BEEN FORMED IN A CYCLIC REDUCTION-OXIDATION PROCESS FOR PRODUCING HYDROGEN PEROXIDE EMPLOYING AN ANTHRA QUINONE WORKING INTERMEDIATE,
Claim 2
Independent Claim
84 words
THE METHOD COMPRISING SUBJECTING A SOLUTION OF ANTHRAQUINONE DEGRADATION PRODUCTS TO THE REDUCING ACTION OF A METAL AND AN ACID, SAID METAL BEING FROM THE GROUP CONSISTING OF ZINC AND MAGNESIUM, AND SAID ACID BEING ONE WHICH IS MISCIBLE WITH SAID SOLUTION AND WHICH TOGETHER WITH SAID METAL WILL REDUCE THE ANTHRAQUINONE FROM WHICH SAID DEGRADATION PRODUCTS WERE DERIVED TO THE ANTHRAHYDROQUINONE, SAID ANTHRAQUINONE DEGRADATION PRODUCTS HAVING BEEN FORMED IN A CYCLIC REDUCTION-OXIDATION PROCESS FOR PRODUCING HYDROGEN PEROXIDE EMPLOYING AN ANTHRA QUINONE WORKING INTERMEDIATE,
References Cited (Backward Citations)
US1735763A
Cited
US2739875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |