Patent US3221061A successfully refreshed from Google Patents.
US3221061A
Expired / Lapsed
US
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Process for the production of 2,2-bis-(4-hydroxyphenyl) propane
Assignee: Union Carbide Corp
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Filing: 1961-08-01
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Granted: 1965-11-30
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Expires: 1981-08-01
Abstract
No abstract record available.
Inventors
- 👤 Anson R Grover
- 👤 Robert E Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:37
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/86; C07C37/50; C07C37/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN THE PROCESS FOR THE PRODUCTION OF 2,2-BIS(4-HYDROXYPHENYL) PROPANE COMPRISING REACTING PHENOL AND ACETONE TOGETHER UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS IN A REACTION ZONE IN CONTACT WITH AN ACIDIC CONDENSING AGENT, WITHDRAWING FROM THE REACTION ZONE AN EFFLUENT COMPRISING 2,2-BIS(4-HYDROXYPHENOL) PROPANE, PHENOL, ACETONE, WATER AND ACETONE-PHENOL REACTION BY-PRODUCTS, CONCENTRATING THE EFFLUENT BY REMOVAL OF SUBSTANTIALLY ALL OF THE ACETONE AND THE WATER, AND REMOVING 2,2-BIS-(4-HYDROXYPHENOL) PROPANE FROM THE EFFLUENT, THE IMPROVEMENT WHICH CONSISTS ESSENTIALLY OF CONTACTING THE CONCENTRATED ACETONE-FREE EFFLUENT, HAVING A DIMINISHED 2,2-BIS(4-HYDROXYPHENYL) PROPANE CONTENT AND A WATER CONTENT OF LESS THAN 0.5 PERCENT BY WEIGHT WITH A POROUS MASS OF SUBSTANTIALLY ANHY-
Claim 2
Dependent Claim
103 words
IN THE PROCESS FOR THE PRODUCTION OF 2,2-BIS(4-HYDROXYPHENYL) PROPANE COMPRISING REACTING PHENOL AND ACETONE TOGETHER UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS IN A REACTION ZONE IN CONTACT WITH AN ACIDIC CONDENSING AGENT, WITHDRAWING FROM THE REACTION ZONE AN EFFLUENT COMPRISING 2,2-BIS(4-HYDROXYPHENOL) PROPANE, PHENOL, ACETONE, WATER AND ACETONE-PHENOL REACTION BY-PRODUCTS, CONCENTRATING THE EFFLUENT BY REMOVAL OF SUBSTANTIALLY ALL OF THE ACETONE AND THE WATER, AND REMOVING 2,2-BIS-(4-HYDROXYPHENOL) PROPANE FROM THE EFFLUENT, THE IMPROVEMENT WHICH CONSISTS ESSENTIALLY OF CONTACTING THE CONCENTRATED ACETONE-FREE EFFLUENT, HAVING A DIMINISHED 2,2-BIS(4-HYDROXYPHENYL) PROPANE CONTENT AND A WATER CONTENT OF LESS THAN 0.5 PERCENT BY WEIGHT WITH A POROUS MASS OF SUBSTANTIALLY ANHY-
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |