Patent US2604490A successfully refreshed from Google Patents.
US2604490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of dicarboxylic acids
Assignee: Individual
•
Filing: 1951-02-03
•
Granted: 1952-07-22
•
Expires: 1971-02-03
Abstract
No abstract record available.
Inventors
- 👤 Reppe Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:48
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/16; B01J31/18; B01J31/1805; C; C07; C07C; C07C51/00; C07C51/10; C07C51/14; B01J2531/00; B01J2531/80; B01J2531/84; B01J2531/847
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
A PROCESS FOR PRODUCING ALIPHATIC DICARBOXYLIC ACIDS WHICH COMPRISES REACTING CARBON MONOXIDE AND WATER WITH AN A,B-UNSATURATED MONOCARBOXYLIC ACID IN AN ALKALINE MEDIUM AT ELEVATED TEMPERATURE AND UNDER INCREASED PRESSURE IN THE PRESENCE OF A COMPLEX NICKEL CYANIDE CATALYST.
Claim 2
Dependent Claim
39 words
A PROCESS FOR PRODUCING ALIPHATIC DICARBOXYLIC ACIDS WHICH COMPRISES REACTING CARBON MONOXIDE AND WATER WITH AN A,B-UNSATURATED MONOCARBOXYLIC ACID IN AN ALKALINE MEDIUM AT ELEVATED TEMPERATURE AND UNDER INCREASED PRESSURE IN THE PRESENCE OF A COMPLEX NICKEL CYANIDE CATALYST.
References Cited (Backward Citations)
US2448368A
Cited
US2562393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |