US2798035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of acrylonitrile
Assignee: Wyeth Holdings LLC
•
Filing: 1955-10-05
•
Granted: 1957-07-02
•
Expires: 1975-10-05
Abstract
No abstract record available.
Inventors
- 👤 Derbenwick Frank
- 👤 Albert W Jefts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:17
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
IN THE PREPARATION OF ACRYLONITRILE IN WHICH HCN AND ACETYLENE ARE REACTED TO FORM AN ACRYLONITRILE-BEARING GAS, IS SCRUBBED WITH WATER TO FORM A DILUTE SOLUTION OF ACRYLONITRILE IN WATER CONTAINING ACETALDEHYDE, HCN AND LACTONITRILE, SAID SOLUTION IS SUBJECTED TO STEAM STRIPPING TO CONCENTRATE IT, AND RESULTANT CONCENTRATED ACRYLONITRILE IS TREATED TO PRODUCE A PURIFIED ACRYLONITRILE PRODUCT, THE IMPROVEMENT IN COMBINATION THEREWITH WHICH COMPRISES: PROVIDING IN SAID CONCENTRATED ACRVLONITRILE A FREE-HCN CONTENT IN EXCESS OF THAT STOICHIOMETRICALLY EQUIVALENT TO THE ACETALDEHYDE CONTENT.
References Cited (Backward Citations)
US2385551A
Cited
US2385327A
Cited
US2370849A
Cited
US2419186A
Cited
US2664396A
Cited
US2719169A
Cited
US2653966A
Cited
US2733289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |