US3223735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of 1,3-propylene diamine
Assignee: BASF SE
•
Filing: 1962-12-10
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Granted: 1965-12-14
•
Expires: 1982-12-10
Abstract
No abstract record available.
Inventors
- 👤 Scholz Heinrich
- 👤 Guenthert Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:28
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/44; C07C209/48; C07C209/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A CONTINUOUS PROCESS FOR THE PRODUCTION OF 1,3PROPYLENE DIAMINE WHICH COMPRISES CONTINUOUSLY MIXING ACRYLONITRILE WITH AN EXCESS OF LIQUID AMMONIA IN A RATIO OF 5 TO 20 PARTS BY WEIGHT OF AMMONIA TO ONE PART BY WEIGHT OF ACRYLONITRILE AND CONTINUOUSLY TREATING THE LIQUID MIXTURE WITH HYDROGEN AT A TEMPERATURE OF FROM 20* TO 200*C. AND UNDER PRESSURE OF BETWEEN 15 AND 500 ATMOSPHERES IN THE PRESENCE OF A HYDROGENATION CATALYST.
Claim 2
Dependent Claim
71 words
A CONTINUOUS PROCESS FOR THE PRODUCTION OF 1,3PROPYLENE DIAMINE WHICH COMPRISES CONTINUOUSLY MIXING ACRYLONITRILE WITH AN EXCESS OF LIQUID AMMONIA IN A RATIO OF 5 TO 20 PARTS BY WEIGHT OF AMMONIA TO ONE PART BY WEIGHT OF ACRYLONITRILE AND CONTINUOUSLY TREATING THE LIQUID MIXTURE WITH HYDROGEN AT A TEMPERATURE OF FROM 20* TO 200*C. AND UNDER PRESSURE OF BETWEEN 15 AND 500 ATMOSPHERES IN THE PRESENCE OF A HYDROGENATION CATALYST.
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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |