Patent US2772291A successfully refreshed from Google Patents.
US2772291A
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Hydrogenation of maleic anhydride
Assignee: EIDP Inc
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Filing: 1953-08-31
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Granted: 1956-11-27
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Expires: 1973-08-31
Abstract
No abstract record available.
Inventors
- 👤 Jr Herbert F Mcshane
- 👤 Walter W Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:30
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
82 words
THE PROCESS FOR THE PRODUCTION OF TETRAHYDROFURAN, TETRAMETHYLENE GLYCOL, AND GAMMA-BUTYROLACTONE WHICH COMPRISES REACTING MALEIC ANHYDRIDE WITH HYDROGEN AT A TEMPERATURE BETWEEN 175C. AND 300*C. AND A PRESSURE BETWEEN 500 P.S.I. AND 12,000 P.S.I. IN THE PRESENCE OF A CATALYST OBTAINED BY THE REDUCTION WITH HYDROGEN OF A MIXTURE OF NICKEL AMMINOMOLYBDATE AND NICKEL AMMINOCHROMATE UNTIL THE SAME CONTAINS AT LEAST TRACES OF ELEMENTAL NICKEL AND HAS THE APPROXIMATE COMPOSITION (NIMO02)A.(NIXCRYOZ)B WHERE A:B=2:1 TO 1:2, X:Y=1.6:1 TO 2.2:1 AND Z:Y-2:1 TO 3:1.
Claim 2
Dependent Claim
82 words
THE PROCESS FOR THE PRODUCTION OF TETRAHYDROFURAN, TETRAMETHYLENE GLYCOL, AND GAMMA-BUTYROLACTONE WHICH COMPRISES REACTING MALEIC ANHYDRIDE WITH HYDROGEN AT A TEMPERATURE BETWEEN 175C. AND 300*C. AND A PRESSURE BETWEEN 500 P.S.I. AND 12,000 P.S.I. IN THE PRESENCE OF A CATALYST OBTAINED BY THE REDUCTION WITH HYDROGEN OF A MIXTURE OF NICKEL AMMINOMOLYBDATE AND NICKEL AMMINOCHROMATE UNTIL THE SAME CONTAINS AT LEAST TRACES OF ELEMENTAL NICKEL AND HAS THE APPROXIMATE COMPOSITION (NIMO02)A.(NIXCRYOZ)B WHERE A:B=2:1 TO 1:2, X:Y=1.6:1 TO 2.2:1 AND Z:Y-2:1 TO 3:1.
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 |