Patent US2531173A successfully refreshed from Google Patents.
US2531173A
Expired / Lapsed
US
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Preparation of terephthalic acid
Assignee: California Research LLC
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Filing: 1947-11-17
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Granted: 1950-11-21
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Expires: 1967-11-17
Abstract
No abstract record available.
Inventors
- 👤 Jr William G Toland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:15
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A PROCESS FOR THE PRODUCTION OF A BENZENE PARA DICARBOXYLIC ACID WHICH COMPRISES NONCATALYTICALLY OXIDIZING A BENZENE MONCARBOXYLIC ACID POSSESSING AN ALKYL GROUP PARA TO THE CARBOXYL GROUP BY INTIMATE CONTACT WITH AN OXYGENCONTAINING GAS IN THE LIQUID PHASE AT THE TEMPERATURE WITHIN THE RANGE OF ABOUT 370 TO 550*F.
Claim 2
Dependent Claim
50 words
A PROCESS FOR THE PRODUCTION OF A BENZENE PARA DICARBOXYLIC ACID WHICH COMPRISES NONCATALYTICALLY OXIDIZING A BENZENE MONCARBOXYLIC ACID POSSESSING AN ALKYL GROUP PARA TO THE CARBOXYL GROUP BY INTIMATE CONTACT WITH AN OXYGENCONTAINING GAS IN THE LIQUID PHASE AT THE TEMPERATURE WITHIN THE RANGE OF ABOUT 370 TO 550*F.
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) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |