US2729674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decarboxylation of trimellitic acid
Assignee: Union Oil Company of California
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Filing: 1954-02-08
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Granted: 1956-01-03
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Expires: 1974-02-08
Abstract
No abstract record available.
Inventors
- 👤 Art C Mckinnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:56
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/377; C07C51/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A METHOD FOR DECARBOXYYLATING TRIMELLITIC ACID TO FORM ISOPHTHALIC ACID WHICH COMPRISES HEATING TRIMELLITIC ACID AT A TEMPERATURE BETWEEN ABOUT 150* AND 400* C. IN THE PRESENCE OF WATER AND A SIGNIFICANT PROPORTION OF ALKALI WHICH IS LESS THAN STOICHIOMETRIC BUT SUFFICIENT TO INCREASE MATERIALLY THE RATIO OF ISOPHTHALIC ACID/TEREPHTHALIC ACID FORMED OVER THAT FORMED IN THE ABSENCE OF ALKALI, AND RECOVERING THE RESULTING ISOPHTHALIC ACID.
Claim 2
Independent Claim
66 words
A METHOD FOR DECARBOXYYLATING TRIMELLITIC ACID TO FORM ISOPHTHALIC ACID WHICH COMPRISES HEATING TRIMELLITIC ACID AT A TEMPERATURE BETWEEN ABOUT 150* AND 400* C. IN THE PRESENCE OF WATER AND A SIGNIFICANT PROPORTION OF ALKALI WHICH IS LESS THAN STOICHIOMETRIC BUT SUFFICIENT TO INCREASE MATERIALLY THE RATIO OF ISOPHTHALIC ACID/TEREPHTHALIC ACID FORMED OVER THAT FORMED IN THE ABSENCE OF ALKALI, AND RECOVERING THE RESULTING ISOPHTHALIC ACID.
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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |