Patent US2338057A successfully refreshed from Google Patents.
US2647146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of diprimary diamines
Assignee: EIDP Inc
•
Filing: 1949-07-01
•
Granted: 1953-07-28
•
Expires: 1969-07-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Paul Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:18
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/02; C07; C07C; C07C209/00; C07C209/44; C07C209/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR THE PREPARATION OF DIPRIMARY DIAMINES WHEREIN A DINITRILE HAVING TWO CYANO, -CN, GROUPS DIRECTLY ATTACHED, EACH THROUGH -C(CH3)2- RADICAL TO THE TERMINI OF A CHAIN COMPOSED OF FROM 5 TO 15 BUTADINE UNITS IS HYDROGENATED BY MEANS OF HYDROGEN AT A PRESSURE OF 200-5000 ATMOSPHERES AND AT A TEMPERATURE OF 180-300* C. IN THE PRESENCE OF AMMONIA AND A PALLADIUM AND NICKLE CATALYST TO A DIPRIMARY DIAMINE HAVING TWO H2NCH2 GROUPS EACH ATTACHED THROUGH A-C(CH3)2- RADICAL TO THE TERMINI OF A CHAIN OF FROM 5 TO 15 DIHYDROBUTADIENE UNITS AND SAID DIAMINE IS RECOVERED.
Claim 2
Dependent Claim
97 words
A PROCESS FOR THE PREPARATION OF DIPRIMARY DIAMINES WHEREIN A DINITRILE HAVING TWO CYANO, -CN, GROUPS DIRECTLY ATTACHED, EACH THROUGH -C(CH3)2- RADICAL TO THE TERMINI OF A CHAIN COMPOSED OF FROM 5 TO 15 BUTADINE UNITS IS HYDROGENATED BY MEANS OF HYDROGEN AT A PRESSURE OF 200-5000 ATMOSPHERES AND AT A TEMPERATURE OF 180-300* C. IN THE PRESENCE OF AMMONIA AND A PALLADIUM AND NICKLE CATALYST TO A DIPRIMARY DIAMINE HAVING TWO H2NCH2 GROUPS EACH ATTACHED THROUGH A-C(CH3)2- RADICAL TO THE TERMINI OF A CHAIN OF FROM 5 TO 15 DIHYDROBUTADIENE UNITS AND SAID DIAMINE IS RECOVERED.
References Cited (Backward Citations)
NL57903C
Cited
DE583565C
Cited
US2245129A
Cited
NL52489C
Cited
US2190770A
Cited
US2132388A
Cited
US2139679A
Cited
US2388034A
Cited
GB570532A
Cited
GB612712A
Cited
US2460733A
Cited
DK61577A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |