Patent US2745864A successfully refreshed from Google Patents.
US2745864A
Expired / Lapsed
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Method of prteparing unsaturated nitriles
Assignee: Wyeth Holdings LLC
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Filing: 1953-02-18
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Granted: 1956-05-15
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Expires: 1973-02-18
Abstract
No abstract record available.
Inventors
- 👤 James K Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:28
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/04; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
THE METHOD OF PREPARING AN UNSATURATED NITRILE WHICH COMPRISES HEATING AN OLEFIN IN THE PRESENCE OF CYANOGEN CHLORIDE AT A TEMPERATURE OF AT LEAST ABOUT 450* C., AND RECOVERING THE THUS-FORMED UNSATURATED NITRILE.
Claim 2
Independent Claim
33 words
THE METHOD OF PREPARING AN UNSATURATED NITRILE WHICH COMPRISES HEATING AN OLEFIN IN THE PRESENCE OF CYANOGEN CHLORIDE AT A TEMPERATURE OF AT LEAST ABOUT 450* C., AND RECOVERING THE THUS-FORMED UNSATURATED NITRILE.
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) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |