US2744882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsymmetrical diphenylol methanes
Assignee: Union Carbide Corp
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Filing: 1949-01-26
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Granted: 1956-05-08
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Expires: 1969-01-26
Abstract
No abstract record available.
Inventors
- 👤 Howard L Bender
- 👤 Alford G Farnham
- 👤 John W Guyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:37
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28; C08G16/00; C08G16/02; C08G16/0212; C08G16/0218; C08G16/0225
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
METHOD OF PREPARING UNSYMMETRICAL DIPHENYLOL METHANES, WHICH COMPRISE REACTING AT A TEMPERATURE BETWEEN 100* C. AND 200* C. AND A PH BETWEEN 4 AND 7 A MIXTURE COMPRISING SALIGENIN AND AN EXCESS MOLAR QUANTITY OF A PHENOL HAVING AT LEAST ONE REACTIVE POSTION AND ATTACHED TO THE PHENOLIC RING IN ADDITION TO A PHENOLIC HYDROXYL GROUP AT LEAST ONE MORE MONOVALENT RADICAL SELECTED FROM THE GROUP CONSISTING OF ALKYL, CYCLOALKYL, ARYL, ALKENYL, ALKOXY AND HYDROXY AND REMOVING WATER FORMED DURING THE CONDENSATION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |