Patent US2681045A successfully refreshed from Google Patents.
Patent US2532311A successfully refreshed from Google Patents.
US2532311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas phase hydrogenation of dihydromucononitrile to adiponitrile
Assignee: EIDP Inc
•
Filing: 1948-07-07
•
Granted: 1950-12-05
•
Expires: 1968-07-07
Abstract
No abstract record available.
Inventors
- 👤 Benjamin W Howk
- 👤 Mark W Farlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:43
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A PROCESS OF PREPARING ADIPONITRILE WHICH COMPRISES CONTACTING A VAPOROUS MIXTURE COMPRISING A 1,4-DICYANOBUTENE AND AT LEAST ONE MOLE OF HYDROGEN PER MOLE OF DICYANOBUTENE, AT A PRESSURE OF FROM 0.5 TO 5.0 ATMOSPHERES AND AT A TEMPERATURE OF FROM 200* TO 350*C., WITH A PALLADIUM CATALYST.
Claim 2
Dependent Claim
47 words
A PROCESS OF PREPARING ADIPONITRILE WHICH COMPRISES CONTACTING A VAPOROUS MIXTURE COMPRISING A 1,4-DICYANOBUTENE AND AT LEAST ONE MOLE OF HYDROGEN PER MOLE OF DICYANOBUTENE, AT A PRESSURE OF FROM 0.5 TO 5.0 ATMOSPHERES AND AT A TEMPERATURE OF FROM 200* TO 350*C., WITH A PALLADIUM CATALYST.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |