US2772293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of hydrogenating maleic anhydride with a nickel or cobalt molybdite catalyst
Assignee: EIDP Inc
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Filing: 1953-07-13
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Granted: 1956-11-27
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Expires: 1973-07-13
Abstract
No abstract record available.
Inventors
- 👤 Walter W Gilbert
- 👤 Benjamin W Howk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:18
CPC Classifications
C; C07; C07D; C07D315/00; C07C; C07C29/00; C07C29/17; C07C29/177; C07D307/00; C07D307/02; C07D307/04; C07D307/06; C07D307/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
THE PROCESS WHICH COMPRISES REACTING MALEIC ANHYDRIDE WITH HYDROGEN AT A TEMEPERATURE BETWEEN 160*C. AND 300*C. AND A PRESSURE BETWEEN 150 ATMOSPHERES AND 3000 ATMOSPHERES IN THE PRESENCE OF A METAL MOLYBDITE FROM THE GROUP CONSISTING OF NICKEL AND COBALT MOLYBDITES, FILTERING, AND RECOVERING TETRAHYDROFURAN, GAMMA-BUTYROLACTONE, AND TETRAMETHYLENE GLYCOL FROM THE FILTRATE.
Claim 2
Dependent Claim
52 words
THE PROCESS WHICH COMPRISES REACTING MALEIC ANHYDRIDE WITH HYDROGEN AT A TEMEPERATURE BETWEEN 160*C. AND 300*C. AND A PRESSURE BETWEEN 150 ATMOSPHERES AND 3000 ATMOSPHERES IN THE PRESENCE OF A METAL MOLYBDITE FROM THE GROUP CONSISTING OF NICKEL AND COBALT MOLYBDITES, FILTERING, AND RECOVERING TETRAHYDROFURAN, GAMMA-BUTYROLACTONE, AND TETRAMETHYLENE GLYCOL FROM THE FILTRATE.
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) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |