US2888465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of trimellitic anhydride
Assignee: Standard Oil Co
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Filing: 1957-05-27
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Granted: 1959-05-26
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Expires: 1977-05-27
Abstract
No abstract record available.
Inventors
- 👤 Hodes William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:37
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PROCESS FOR PREPARING TRIMELLITIC ANHYDRIDE WHICH COMPRISES INTERMINGLING TRIMELLITIC ACID, ACETIC ANHYDRIDE AND A NORMALLY LIQUID ALKYLBENZENE, SAID ACETIC ANHYDRIDE BEING PRESENT IN AN AMOUNT BETWEEN 1 AND 3 MOLS PER MOL OF TRIMELLITIC ACID PRESENT AND SAID ALKYLBENZENE BEING PRESENT IN AN AMOUNT BETWEEN ABOUT 0.5 AND 10 PARTS BY WEIGHT PER PART OF TRIMELLITIC ACID PRESENT, AT A TEMPERATURE BETWEEN ABOUT 80* C. AND 135* C. FOR A TIME AT LEASTSUFFICIENT TO FORM A SINGLE ESSENTIALLY HOMOGENEOUS LIQUID PHASE, COOLING SAID LIQUID PHASE TO A TEMPERATURE WHERE A SOILD CRYSTALLINE PHASE CONSISTING ESSENTIALLY OF TRIMELLITIC ANHYDRIDE IS FORMED AND SEPSRSTING SAID SOLID CRYSTALLINE PHASE FROM THE MOTHER LIQUOR.
Claim 2
Dependent Claim
111 words
A PROCESS FOR PREPARING TRIMELLITIC ANHYDRIDE WHICH COMPRISES INTERMINGLING TRIMELLITIC ACID, ACETIC ANHYDRIDE AND A NORMALLY LIQUID ALKYLBENZENE, SAID ACETIC ANHYDRIDE BEING PRESENT IN AN AMOUNT BETWEEN 1 AND 3 MOLS PER MOL OF TRIMELLITIC ACID PRESENT AND SAID ALKYLBENZENE BEING PRESENT IN AN AMOUNT BETWEEN ABOUT 0.5 AND 10 PARTS BY WEIGHT PER PART OF TRIMELLITIC ACID PRESENT, AT A TEMPERATURE BETWEEN ABOUT 80* C. AND 135* C. FOR A TIME AT LEASTSUFFICIENT TO FORM A SINGLE ESSENTIALLY HOMOGENEOUS LIQUID PHASE, COOLING SAID LIQUID PHASE TO A TEMPERATURE WHERE A SOILD CRYSTALLINE PHASE CONSISTING ESSENTIALLY OF TRIMELLITIC ANHYDRIDE IS FORMED AND SEPSRSTING SAID SOLID CRYSTALLINE PHASE FROM THE MOTHER LIQUOR.
References Cited (Backward Citations)
US2753373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |