US2773897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of methylsuccinic acid and metal salts thereof
Assignee: Pfizer Inc
•
Filing: 1952-06-07
•
Granted: 1956-12-11
•
Expires: 1972-06-07
Abstract
No abstract record available.
Inventors
- 👤 Bavley Abraham
- 👤 Charles J Knuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:49
CPC Classifications
C; C07; C07C; C07C55/00; C07C55/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A PROCESS WHICH COMPRISES CATALYTICALLY HYDROGENATING AN ALKALI METAL ITACONATE IN THE PRESENCE OF A RANEY NICKEL CATALYST AT A TEMPERATURE FROM ABOUT 45* TO 200* C. AND UNDER SUPERATMOSPHERIC HYDROGEN PRESSURE.
Claim 2
Dependent Claim
32 words
A PROCESS WHICH COMPRISES CATALYTICALLY HYDROGENATING AN ALKALI METAL ITACONATE IN THE PRESENCE OF A RANEY NICKEL CATALYST AT A TEMPERATURE FROM ABOUT 45* TO 200* C. AND UNDER SUPERATMOSPHERIC HYDROGEN PRESSURE.
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) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |