Patent US3769321A successfully refreshed from Google Patents.
US3769321A
Expired / Lapsed
US
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Process for preparing aryl hydroxybenzoate
Assignee: Asahi Kasei Corp
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Filing: 1971-12-17
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Granted: 1973-10-30
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Expires: 1991-12-17
Abstract
Abstract ARYL HYDROXYBENZATE REPRESENTED BY THE FORMULA, AR-OOC-C6H4-OH WHEREIN AR IS AN UNSUBSTITUTED OR SUBSTITUTED ARYL RADICAL, IS PREPARED BY REACTING AN ACYLOXYBENZOIC ACID REPRESENTED BY THE FORMULA, R-OOC-C6H4-COOH WHEREIN R IS AN ALKYL GROUP HAVING 1 TO 5 CARBON ATOMS, WITH A HYDROXYARYL COMPOUND REPRESENTED BY THE FORMULA, AR-OH, IN THE PRESENCE OF AN ESTERIFICATION CATALYST AT A TEMPERATURE OF 100*-260*C.
Inventors
- 👤 T Kato
- 👤 K Yoshimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:37
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/84; C07C69/88
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |