US3331877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing 1, 3-diaminopropane
Assignee: Wyeth Holdings LLC
•
Filing: 1963-11-13
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Granted: 1967-07-18
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Expires: 1983-11-13
Abstract
No abstract record available.
Inventors
- 👤 Smolin Edwin Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:14
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/44; C07C209/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
A PROCESS FOR PREPARING 1,3-DIAMINOPROPANE WHICH COMPRISES HEATING AN ALKYLENE BIS-OXYDIPROPIONITRILE WITH A NICKEL OR COBALT HYDROGENATION CATALYST UNDER HYDROGEN PRESSURE AND IN THE PRESENCE OF EXCESS AMMONIA.
Claim 2
Dependent Claim
28 words
A PROCESS FOR PREPARING 1,3-DIAMINOPROPANE WHICH COMPRISES HEATING AN ALKYLENE BIS-OXYDIPROPIONITRILE WITH A NICKEL OR COBALT HYDROGENATION CATALYST UNDER HYDROGEN PRESSURE AND IN THE PRESENCE OF EXCESS AMMONIA.
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) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |