Patent US2668859A successfully refreshed from Google Patents.
US2668859A
Expired / Lapsed
US
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Process for the production of phenol and acetone
Assignee: Rhone Poulenc SA
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Filing: 1952-01-02
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Granted: 1954-02-09
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Expires: 1972-01-02
Abstract
No abstract record available.
Inventors
- 👤 Scriabine Igor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:41
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/08; C07C45/00; C07C45/51; C07C45/53
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A PROCESS FOR THE SIMULTANEOUS PREPARATION OF PHENOL AND ACETONE BY FISSION OF CUMENE HYDROPEROXIDE WHICH COMPRISES HEATING CUMENE HYDROPEROXIDE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS IN THE PRESENCE OF A CATALYST WHICH IS A SOLID ELEMENT OF ONE OF THE SUB-GROUPS B OF GROUPS V AND VI OF THE PERIODIC TABLE OF THE ELEMENTS.
Claim 2
Dependent Claim
53 words
A PROCESS FOR THE SIMULTANEOUS PREPARATION OF PHENOL AND ACETONE BY FISSION OF CUMENE HYDROPEROXIDE WHICH COMPRISES HEATING CUMENE HYDROPEROXIDE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS IN THE PRESENCE OF A CATALYST WHICH IS A SOLID ELEMENT OF ONE OF THE SUB-GROUPS B OF GROUPS V AND VI OF THE PERIODIC TABLE OF THE ELEMENTS.
References Cited (Backward Citations)
US2484841A
Cited
US2557968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |