US2574693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of secondary aliphatic amines from primary aliphatic amines
Assignee: Shell Development Co
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Filing: 1948-06-10
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Granted: 1951-11-13
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Expires: 1968-06-10
Abstract
No abstract record available.
Inventors
- 👤 Engel Willem Frederik
- 👤 Hoog Han
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:31
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/60; C07C211/00; C07C211/01; C07C211/02; C07C211/03
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
111 words
A PROCESS FOR THE PRODUCTION OF A DIALKYL AMINE WHICH COMPRISES CONTACTING THE CORRESPONDING ALKYL AMINE IN ADMIXTURE WITH ABOUT 0.1 TO ABOUT 5 MOLS OF AMMONIA PER MOL OF SAID PRIMARY AMINE WITH AN ALUMINA OXIDE CATALYST A REACTION ZONE AT A TEMPERATURE OF ABOUT 275* C. TO ABOUT 500* C. AND A PRESSURE OF ABOUT 70 TO ABOUT 750 POUNDS, THEREBY CONVERTING SAID ALKYL AMINE TO REACTION PRODUCTS COMPRISING SAID DIALKYL AMINE AND AMMONIA, SEPARATING A FRACTION COMPRISING AMMONIA AND A FRACTION COMPRISING SAID DIALKYL AMINE FROM THE EFFLUENCE OF SAID REACTION ZONE, AND RECYCLING AT LEAST A PART OF SAID FRACTION COMPRISING SAID AMMONIA TO SAID REACTION ZONE.
References Cited (Backward Citations)
DE609245C
Cited
US2098039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |