US2497304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of carboxylic acid anhydrides
Assignee: EIDP Inc
•
Filing: 1945-11-23
•
Granted: 1950-02-14
•
Expires: 1965-11-23
Abstract
No abstract record available.
Inventors
- 👤 William F Gresham
- 👤 Richard E Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:28
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR THE SYNTHESIS OF CARBOXYLIC ACID ANHYDRIDES WHICH COMPRISES REACTING UNDER ANHYDROUS CONDITIONS A CARBOXYLIC ACID OF THE FORMULA RCOOH, R BEING AN ALKYL GROUP, WITH A HYDROCARBON CONTAINING NON-AROMATIC MONOLEFINIC UNSATURATION, AND CARBON MONOXIDE, AT A TEMPERATURE WITHIN THE RANGE OF 200* TO 500*C.., UNDER A PRESSURE OF 25 TO 2000 ATMOSPHERES, IN THE PRESENCE OF A NICKEL-CONTAINING CATALYST OF THE CLASS CONSISTING OF NICKEL CARBONYL AND SUBSTANCES WHICH PRODUCE NICKEL CARBONYL UNDER THE CONDITIONS OF THE REACTION, WHEREBY A REACTION PRODUCT CONTAINING ORGANIC CAROXYLIC ACID ANHYDRIDE IS PRODUCED AND THEREAFTER SEPARATING THE SAID ORGANIC CARBOCYLIC ACID ANHYDRIDE FROM THE RESULTING MIXTURE.
Claim 2
Dependent Claim
105 words
A PROCESS FOR THE SYNTHESIS OF CARBOXYLIC ACID ANHYDRIDES WHICH COMPRISES REACTING UNDER ANHYDROUS CONDITIONS A CARBOXYLIC ACID OF THE FORMULA RCOOH, R BEING AN ALKYL GROUP, WITH A HYDROCARBON CONTAINING NON-AROMATIC MONOLEFINIC UNSATURATION, AND CARBON MONOXIDE, AT A TEMPERATURE WITHIN THE RANGE OF 200* TO 500*C.., UNDER A PRESSURE OF 25 TO 2000 ATMOSPHERES, IN THE PRESENCE OF A NICKEL-CONTAINING CATALYST OF THE CLASS CONSISTING OF NICKEL CARBONYL AND SUBSTANCES WHICH PRODUCE NICKEL CARBONYL UNDER THE CONDITIONS OF THE REACTION, WHEREBY A REACTION PRODUCT CONTAINING ORGANIC CAROXYLIC ACID ANHYDRIDE IS PRODUCED AND THEREAFTER SEPARATING THE SAID ORGANIC CARBOCYLIC ACID ANHYDRIDE FROM THE RESULTING MIXTURE.
References Cited (Backward Citations)
US1884626A
Cited
US1884627A
Cited
GB316898A
Cited
US1973662A
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US2015065A
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US2007642A
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US2079216A
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US2089903A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |