Patent US3773832A successfully refreshed from Google Patents.
US3773832A
Expired / Lapsed
US
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Hydrogenation of adiponitrile over alkali-modified cobalt catalyst
Assignee: EIDP Inc
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Filing: 1970-01-16
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Granted: 1973-11-20
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Expires: 1990-01-16
Abstract
Abstract HEXAMETHYLENEDIAMINE IS PREPARED BY HYDROGENATING ADIPONITRILE IN THE PRESENCE OF AN EXCESS OF HYDROGEN AT A TOTAL SYSTEM PRESSURE OF FROM 3000 TO 6000 P.S.I.G. IN THE PRESENCE OF FROM ABOUT 200 TO 800% OF AMMONIA, BASED ON THE WEIGHT OF THE ADIPONITRILE, AT A TEMPERATURE OF FROM ABOUT 85* C. TO ABOUT 185* C. IN THE PRESENCE OF A PELLETED, SINTERED, REDUCED COBALT OXIDE CATALYST ON WHICH IS MAINTAINED FROM ABOUT 200 TO LESS THAN 1000 PARTS PER MILLION OF A STRONG BASE.
Inventors
- 👤 L Brake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:20
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/74; B01J23/75; C; C07; C07C; C07C209/00; C07C209/44; C07C209/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |