Patent US2860036A successfully refreshed from Google Patents.
US2860036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of anthraquinone solutions
Assignee: Evonik LCL Ltd
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Filing: 1954-04-22
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Granted: 1958-11-11
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Expires: 1974-04-22
Abstract
No abstract record available.
Inventors
- 👤 Lait Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:56
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/022; C01B15/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR THE REMOVAL OF SUBSTITUTED TETRAHYDROANTHRAQUINOLS FROM SUBSTITUTED ANTHRAQUINONES IN AN ORGANIC SOLVENT SOLUTION RESULTING FROM THE OXIDATION STEP OF THE CYCLIC PROCESS FOR THE PRODUCTION OF HYDROGEN PEROXIDE INCLUDING THE ALTERNATE REDUCTIOIN AND OXIDATION OF SAID SUBSTITUTED ANTHRAQUINONE DISSOLVED IN SAID SOLVENT COMPRISING CONTACTING SAID ORGAINC SOLUTION WITH AN AQUEOUS SOLUTION OF A WATER-SOLUBLE METAL HYDROXIDE TO FORM A WATER-SOLUBLE SALT OF SAID TETRAHYDRO-ANTHRAQUINOL, SEPARATING SAID SOLUTIONS FROM ONE ANOTHER, OXIDIZING SAID TETRAHYDRO-ANTHRAQUINOL SALT IN SAID SEPARATED AQUEOUS SOLUTION TO PERCIPITATE A COMPOUND SELECTED FROM THE GROUP CONSISTING OF A SUBSTITUTED TETRAHYDRO-ANTHRAQUINONE AND A SUBSTITUTED ANTHRAQUINONE, AND SEPARATNG SAID COMPOUND FROM SAID AQUEOUS SOLUTION.
Claim 2
Dependent Claim
107 words
A PROCESS FOR THE REMOVAL OF SUBSTITUTED TETRAHYDROANTHRAQUINOLS FROM SUBSTITUTED ANTHRAQUINONES IN AN ORGANIC SOLVENT SOLUTION RESULTING FROM THE OXIDATION STEP OF THE CYCLIC PROCESS FOR THE PRODUCTION OF HYDROGEN PEROXIDE INCLUDING THE ALTERNATE REDUCTIOIN AND OXIDATION OF SAID SUBSTITUTED ANTHRAQUINONE DISSOLVED IN SAID SOLVENT COMPRISING CONTACTING SAID ORGAINC SOLUTION WITH AN AQUEOUS SOLUTION OF A WATER-SOLUBLE METAL HYDROXIDE TO FORM A WATER-SOLUBLE SALT OF SAID TETRAHYDRO-ANTHRAQUINOL, SEPARATING SAID SOLUTIONS FROM ONE ANOTHER, OXIDIZING SAID TETRAHYDRO-ANTHRAQUINOL SALT IN SAID SEPARATED AQUEOUS SOLUTION TO PERCIPITATE A COMPOUND SELECTED FROM THE GROUP CONSISTING OF A SUBSTITUTED TETRAHYDRO-ANTHRAQUINONE AND A SUBSTITUTED ANTHRAQUINONE, AND SEPARATNG SAID COMPOUND FROM SAID AQUEOUS SOLUTION.
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) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |