Patent US2692270A successfully refreshed from Google Patents.
US2692270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of arylaliphatic dicarboxylic acids and derivatives thereof
Assignee: Rohm and Haas Co
•
Filing: 1948-12-16
•
Granted: 1954-10-19
•
Expires: 1968-12-16
Abstract
No abstract record available.
Inventors
- 👤 Ellington M Beavers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:26
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/567
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A PROCESS FOR PREPARING ANHYDRIDES OF ARYLALIPHATIC DICARBOXYLIC ACIDS WHICH COMPRISES REACTING A MIXTURE WHICH CONSISTS OF (A) AN ALKYLSUBSTITUTED, MONOCYCLIC, AROMATIC HYDROCARBON HAVING AN ALKYL SUBSTITUTED WHICH IN TURN CONTAINS AN ACTIVE ALPHA HYDROGEN ATOM AND ALSO CONTAINS 2 TO 18 CARBON ATOMS, AND (B) MALEIC ANHYDRIDE, AT A TEMPERATURE OF 80* C. TO 155* C. IN THE PRESENCE OF AN ORGANIC, PEROXIDIC CATALYST, SAID CATALYST BEING PRESENT IN AN AMOUNT EQUAL TO ONE TO TEN MOLE-PERCENT BASED ON SAID MALEIC ANHYDRIDE.
Claim 2
Dependent Claim
83 words
A PROCESS FOR PREPARING ANHYDRIDES OF ARYLALIPHATIC DICARBOXYLIC ACIDS WHICH COMPRISES REACTING A MIXTURE WHICH CONSISTS OF (A) AN ALKYLSUBSTITUTED, MONOCYCLIC, AROMATIC HYDROCARBON HAVING AN ALKYL SUBSTITUTED WHICH IN TURN CONTAINS AN ACTIVE ALPHA HYDROGEN ATOM AND ALSO CONTAINS 2 TO 18 CARBON ATOMS, AND (B) MALEIC ANHYDRIDE, AT A TEMPERATURE OF 80* C. TO 155* C. IN THE PRESENCE OF AN ORGANIC, PEROXIDIC CATALYST, SAID CATALYST BEING PRESENT IN AN AMOUNT EQUAL TO ONE TO TEN MOLE-PERCENT BASED ON SAID MALEIC ANHYDRIDE.
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) | 1957-10-18 | 1958-04-19 | 1958-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-18 | 1962-04-19 | 1962-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-18 | 1966-04-19 | 1966-10-19 | $7700.00 | Window Closed / Lapsed |