Patent US2666780A successfully refreshed from Google Patents.
US2666780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocyanation of olefinic compounds
Assignee: EIDP Inc
•
Filing: 1950-01-07
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Granted: 1954-01-19
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Expires: 1970-01-07
Abstract
No abstract record available.
Inventors
- 👤 Jr Paul Arthur
- 👤 Pratt Burt Carlton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:41
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/44; C07C209/48; C07C253/00; C07C253/08; C07C253/10; C07D; C07D307/00; C07D307/77; C07D307/93; C07C2602/00; C07C2602/36; C07C2602/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
PROCESS FOR THE PREPARATION OF A PENTENENITRILE WHEREIN BUTADIENE IS BROUGHT INTO CONTACT WITH HYDROGEN CYANIDE AT A TEMPERATURE OF AT LEAST 50* C. AND IN THE PRESENCE OF COBALT CARBONYL, CO2(CO)8.
Claim 2
Dependent Claim
32 words
PROCESS FOR THE PREPARATION OF A PENTENENITRILE WHEREIN BUTADIENE IS BROUGHT INTO CONTACT WITH HYDROGEN CYANIDE AT A TEMPERATURE OF AT LEAST 50* C. AND IN THE PRESENCE OF COBALT CARBONYL, CO2(CO)8.
References Cited (Backward Citations)
US1614523A
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US2385741A
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US2509859A
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US2447600A
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US2464723A
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US2455995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |