US3049568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of bisphenols
Assignee: Union Carbide Corp
•
Filing: 1958-10-20
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Granted: 1962-08-14
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Expires: 1978-10-20
Abstract
No abstract record available.
Inventors
- 👤 Francis N Apel
- 👤 Jr Louis B Conte
- 👤 Howard L Bender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:50
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/06; B01J31/08; B01J31/10; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/19; C; C07; C07C; C07C37/00; C07C37/11; C07C37/20; C08; C08F; C08F8/00; C08F8/34; B01J2231/00; B01J2231/30; B01J2231/34; B01J2231/341; B01J2231/347
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A PROCESS FOR THE PRODUCTION OF BISPHENOLS WHICH INCLUDES THE STEPS OF CONTACTING A MIXTURE OF A PHENOL HAVING A REACTIVE HYDROGEN IN THE PARA POSITION TO THE PHENOLIC HYDROXYL AND A KETON HAVING AT LEAST ONE METHYL GROUP CONNECTED TO THE CARBONYL AT A TEMPERATURE OF AT LEAST 40*C., SAID MIXTURE CONTAINING A STOICHIOMETRIC EXCESS OF SAID PHENOL WITH A SUBSTANTIALLY ANHYDROUS CATIONIC EXCHANGING POLYMERIC RESIN WHICH IS PARTIALLY ESTERIFIED WITH A LOWER ALKYL MERCAPTO ALCOHOL AS THE SOLE CATALYST FOR THE REACTION OF THE PHENOL AND THE KETONE, SAID RESIN BEING SUBSTANTIALLY INSOLUBLE IN THE REACTION MIXTURE.
Claim 2
Dependent Claim
99 words
A PROCESS FOR THE PRODUCTION OF BISPHENOLS WHICH INCLUDES THE STEPS OF CONTACTING A MIXTURE OF A PHENOL HAVING A REACTIVE HYDROGEN IN THE PARA POSITION TO THE PHENOLIC HYDROXYL AND A KETON HAVING AT LEAST ONE METHYL GROUP CONNECTED TO THE CARBONYL AT A TEMPERATURE OF AT LEAST 40*C., SAID MIXTURE CONTAINING A STOICHIOMETRIC EXCESS OF SAID PHENOL WITH A SUBSTANTIALLY ANHYDROUS CATIONIC EXCHANGING POLYMERIC RESIN WHICH IS PARTIALLY ESTERIFIED WITH A LOWER ALKYL MERCAPTO ALCOHOL AS THE SOLE CATALYST FOR THE REACTION OF THE PHENOL AND THE KETONE, SAID RESIN BEING SUBSTANTIALLY INSOLUBLE IN THE REACTION MIXTURE.
References Cited (Backward Citations)
US2311282A
Cited
US2359242A
Cited
US2471454A
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US2468982A
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US2628983A
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US2597492A
Cited
US2597437A
Cited
US2802884A
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US2891916A
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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) | 1965-08-13 | 1966-02-12 | 1966-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-13 | 1970-02-12 | 1970-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-13 | 1974-02-12 | 1974-08-14 | $7700.00 | Window Closed / Lapsed |