Patent US3207794A successfully refreshed from Google Patents.
US3207794A
Expired / Lapsed
US
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Novel process for alkylated bisphenols
Assignee: —
•
Filing: —
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Granted: 1965-09-21
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Expires: 1982-09-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:05
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/20; C07C37/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN THE PROCESS OF PREPARING ALKYLATED BISPHENOLS BY CONDENSING AN ALDEHYDE WITH A PHENOL AT A TEMPERATURE BETWEEN 20* AND 100*C. AND IN THE PRESENCE OF AN ACIDIC CATALYST SELECTED FROM THE GROUP CONSISTING OF SULFURIC, PHOSPHORIC, P-TOLUENESULFONIC AND ACETIC ACIDS AND SUBSEQUENTLY ALKYLATING THE BISPHENOL SO FORMED WITH AN OLEFIN IN THE PRESENCE OF A FRIEDEL-CRAFTS ALKYLATION CATALYST AND AT A TEMPERATURE BETWEEN 20*C. AND 120*C., THE IMPROVEMENT OF REMOVING THE WATER FORMED DURING SAID CONDENSATION REACTION BY AN AZEOTROPIC DISTILLATION WITH SAID OLEFIN, CONDENSING THE AZETROPE, SEPARATING THE OLEFIN FROM THE CONDENSED AZEOTHROPE, AND USING THE SEPARATED OLEFIN TO ALKYLATE THE BISPHENOL.
Claim 2
Dependent Claim
104 words
IN THE PROCESS OF PREPARING ALKYLATED BISPHENOLS BY CONDENSING AN ALDEHYDE WITH A PHENOL AT A TEMPERATURE BETWEEN 20* AND 100*C. AND IN THE PRESENCE OF AN ACIDIC CATALYST SELECTED FROM THE GROUP CONSISTING OF SULFURIC, PHOSPHORIC, P-TOLUENESULFONIC AND ACETIC ACIDS AND SUBSEQUENTLY ALKYLATING THE BISPHENOL SO FORMED WITH AN OLEFIN IN THE PRESENCE OF A FRIEDEL-CRAFTS ALKYLATION CATALYST AND AT A TEMPERATURE BETWEEN 20*C. AND 120*C., THE IMPROVEMENT OF REMOVING THE WATER FORMED DURING SAID CONDENSATION REACTION BY AN AZEOTROPIC DISTILLATION WITH SAID OLEFIN, CONDENSING THE AZETROPE, SEPARATING THE OLEFIN FROM THE CONDENSED AZEOTHROPE, AND USING THE SEPARATED OLEFIN TO ALKYLATE THE BISPHENOL.
References Cited (Backward Citations)
US2802884A
Cited
US2734088A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |