US2531172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of isophthalic acid
Assignee: California Research LLC
•
Filing: 1947-11-17
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Granted: 1950-11-21
•
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
2026-10-29 00:18
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS FOR THE PRODUCTION OF A BENZENE META DICARBOXYLIC ACIS WHICH COMPRISES NONCATALYTICALLY OXIDIZING A BENZENE MONOCARBOXYLIC ACID POSSESSING AN ALKYL GROUP META TO THE CARBOXYL GROUP IN THE LIQUID PHASE WITH AN OXYGENCONTAINING GAS AT TEMPERATURES WITHIN THE RANGE OF ABOUT 300 TO 550*F.
Claim 2
Dependent Claim
46 words
A PROCESS FOR THE PRODUCTION OF A BENZENE META DICARBOXYLIC ACIS WHICH COMPRISES NONCATALYTICALLY OXIDIZING A BENZENE MONOCARBOXYLIC ACID POSSESSING AN ALKYL GROUP META TO THE CARBOXYL GROUP IN THE LIQUID PHASE WITH AN OXYGENCONTAINING GAS AT TEMPERATURES WITHIN THE RANGE OF ABOUT 300 TO 550*F.
References Cited (Backward Citations)
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Cited
US1937962A
Cited
US2120672A
Cited
US2199585A
Cited
US2245528A
Cited
US2276774A
Cited
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 |