US2812357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of hydroperoxide carbinols from aromatic hydroperoxides
Assignee: Hercules Powder Co
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Filing: 1954-11-26
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Granted: 1957-11-05
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Expires: 1974-11-26
Abstract
No abstract record available.
Inventors
- 👤 Webster William
- 👤 Thompson Bernard Hammo Markham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:06
CPC Classifications
C; C07; C07C; C07C409/00; C07C409/02; C07C409/04; C07C409/08; C07C409/12; C07C407/00; C07C407/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
THE METHOD OF PURIFICATION OF DIISOPROPYLBENZENE DIHYDROPEROXIDE OF THE GROUP CONSISTING OF THE M- AND P-ISOMERS AND MIXTURES THEREOF WHICH COMPRISES CONTACTING A CRUDE MIXTURE CONSISTING ESSENTIALLY OF SAID DIHYDROPEROXIDE, CONTAMINATED WITH UP TO 20% OF A-HYDROXY-A''-HYDROPEROXYDIISOPYLBENZENE, IN 10 TO 50% WEIGHT/VOLUME SOLUTION IN A NEUTRAL ORGANIC SOLVENT WITH AN AQUEOUS SOLUTION OF SODIUM HYDROXIDE BETWEEN 4 AND 6 N CONCENTRATION IN AT LEAST A STOICHIOMETRIC AMOUNT REQUIRED TO CONVERT ALL HYDROPEROXIDE GROUPS OF THE DIHYDROPEROXIDE TO THE CORRESPONDING SALT, SEPARATING THE SOLID SALT OF SAID DIISOPROPYLBENZENE DIHYDROPEROXIDE FROM THE REMAINING LIQUIDS, HYDROLYZING SAID SALT IN THE PRESENCE OF EXCESS WATER AND SEPARTING THE DIISOPROPYL-LBENZENE DIHYDROPEROXIDE THEREFROM.
Claim 2
Independent Claim
107 words
THE METHOD OF PURIFICATION OF DIISOPROPYLBENZENE DIHYDROPEROXIDE OF THE GROUP CONSISTING OF THE M- AND P-ISOMERS AND MIXTURES THEREOF WHICH COMPRISES CONTACTING A CRUDE MIXTURE CONSISTING ESSENTIALLY OF SAID DIHYDROPEROXIDE, CONTAMINATED WITH UP TO 20% OF A-HYDROXY-A''-HYDROPEROXYDIISOPYLBENZENE, IN 10 TO 50% WEIGHT/VOLUME SOLUTION IN A NEUTRAL ORGANIC SOLVENT WITH AN AQUEOUS SOLUTION OF SODIUM HYDROXIDE BETWEEN 4 AND 6 N CONCENTRATION IN AT LEAST A STOICHIOMETRIC AMOUNT REQUIRED TO CONVERT ALL HYDROPEROXIDE GROUPS OF THE DIHYDROPEROXIDE TO THE CORRESPONDING SALT, SEPARATING THE SOLID SALT OF SAID DIISOPROPYLBENZENE DIHYDROPEROXIDE FROM THE REMAINING LIQUIDS, HYDROLYZING SAID SALT IN THE PRESENCE OF EXCESS WATER AND SEPARTING THE DIISOPROPYL-LBENZENE DIHYDROPEROXIDE THEREFROM.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |