US3197499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purifying benzophenone 4, 4'-dicarboxylic acid
Assignee: Gulf Research and Development Co
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Filing: 1960-11-30
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Granted: 1965-07-27
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Expires: 1980-11-30
Abstract
No abstract record available.
Inventors
- 👤 John H Mccracken
- 👤 Johann G D Schulz
- 👤 Arthur C Whitaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:35
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/27; C07C51/275; C07C51/42; C07C51/487; C07C51/493
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS FOR PURIFYING BENZOPHENONE 4,4''-DICARBOXYLIC ACID OBTAINED AS A RESULT OF THE NITRIC ACID OXIDATION OF 1,1-DI(PARA)TOLYLETHANE WHICHCOMPRISES REACTING SAID DIARYLKETONE CABOXYLIC ACID WITH METHANOL IN EXCESS OF THE AMOUNT STOICHIOMETRICALLY REQUIRED TO REACT WITH SAID DIARYLKETONE CARBOXYLIC ACID WITH METHANOL IN EXCESS OF THE AMOUNT STOICHIOMETRICALLY REQUIRED TO REACT WITH SAID DIARYLKETONE CARBOXYLIC ACID TO OBTAIN THE METHYL ESTER THEREOF AND THEREAFTER RECOVERING THE METHYL ESTER SO OBTAINED.
Claim 2
Dependent Claim
70 words
A PROCESS FOR PURIFYING BENZOPHENONE 4,4''-DICARBOXYLIC ACID OBTAINED AS A RESULT OF THE NITRIC ACID OXIDATION OF 1,1-DI(PARA)TOLYLETHANE WHICHCOMPRISES REACTING SAID DIARYLKETONE CABOXYLIC ACID WITH METHANOL IN EXCESS OF THE AMOUNT STOICHIOMETRICALLY REQUIRED TO REACT WITH SAID DIARYLKETONE CARBOXYLIC ACID WITH METHANOL IN EXCESS OF THE AMOUNT STOICHIOMETRICALLY REQUIRED TO REACT WITH SAID DIARYLKETONE CARBOXYLIC ACID TO OBTAIN THE METHYL ESTER THEREOF AND THEREAFTER RECOVERING THE METHYL ESTER SO OBTAINED.
References Cited (Backward Citations)
US2823228A
Cited
US2569440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |