Patent US2772292A successfully refreshed from Google Patents.
US2772292A
Expired / Lapsed
US
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Hydrogenation of maleic anhydride
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
- 👤 Jr Herbert F Mcshane
- 👤 Jr Robert B Ramsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:03
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
64 words
THE PROCESS FOR THE PRODUCTION OF TETRAHYDROFURAN, TETRAMETHYLENE GLYCOL, AND GAMMA-BUTYROLACTONE WHICH COMPRISES REACTING MALEIC ANHYDRIDE WITH HYDROGEN AT A TEMPERATURE BETWEEN 175*C. AND 300*C. AND A PRESSURE BETWEEN 500 P.S.I. AND 12,000 P.S.I. IN THE PRESENCE OF A PYROPHORIC FORAMINOUS METAL SKELETON OF THE GROUP CONSISTING OF NICKEL AND COBALT SKELETONS REMAINING AFTER THE EXTRACTION OF AN ALLOYING INGREDIENT FROM AN ALLOY THEREOF.
Claim 2
Dependent Claim
64 words
THE PROCESS FOR THE PRODUCTION OF TETRAHYDROFURAN, TETRAMETHYLENE GLYCOL, AND GAMMA-BUTYROLACTONE WHICH COMPRISES REACTING MALEIC ANHYDRIDE WITH HYDROGEN AT A TEMPERATURE BETWEEN 175*C. AND 300*C. AND A PRESSURE BETWEEN 500 P.S.I. AND 12,000 P.S.I. IN THE PRESENCE OF A PYROPHORIC FORAMINOUS METAL SKELETON OF THE GROUP CONSISTING OF NICKEL AND COBALT SKELETONS REMAINING AFTER THE EXTRACTION OF AN ALLOYING INGREDIENT FROM AN ALLOY THEREOF.
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 |