Patent US2761877A successfully refreshed from Google Patents.
US2761877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of phenols and carbonyl compounds
Assignee: Rhone Poulenc SA
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Filing: 1952-05-13
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Granted: 1956-09-04
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Expires: 1972-05-13
Abstract
No abstract record available.
Inventors
- 👤 Mosnier Michel Marins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:37
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A PROCESS FOR THE CONTINUOUS PRODUCTION OF PHENOL AND ACETONE BY THE DECOMPOSITION BY MEANS OF SULPHURIC ACID OF CUMENE HYDROPEROXIDE WHEREIN THE HYDROPEROXIDE AND THE ACID ARE SIMULTANEOUSLY AND CONTINUOUSLY RUN INTO A HEATED MASS CONSISTING ESSENTIALLY OF PHENOL, THE TEMPERATURE OF THE HOMOGENEOUS REACTION MIXTURE IS MAINTAINED BELOW 65* C., AND THE ACETONE IS CONTINUOUSLY REMOVED IN GASEOUS FORM SO THAT THE ACETONE CONTENT OF THE REACTION MIXTURE AT NO TIME EXCEEDS 10% BY WEIGHT.
Claim 2
Dependent Claim
77 words
A PROCESS FOR THE CONTINUOUS PRODUCTION OF PHENOL AND ACETONE BY THE DECOMPOSITION BY MEANS OF SULPHURIC ACID OF CUMENE HYDROPEROXIDE WHEREIN THE HYDROPEROXIDE AND THE ACID ARE SIMULTANEOUSLY AND CONTINUOUSLY RUN INTO A HEATED MASS CONSISTING ESSENTIALLY OF PHENOL, THE TEMPERATURE OF THE HOMOGENEOUS REACTION MIXTURE IS MAINTAINED BELOW 65* C., AND THE ACETONE IS CONTINUOUSLY REMOVED IN GASEOUS FORM SO THAT THE ACETONE CONTENT OF THE REACTION MIXTURE AT NO TIME EXCEEDS 10% BY WEIGHT.
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) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |