US3073753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of acrylonitrile
Assignee: Distillers Co Yeast Ltd
•
Filing: 1960-05-19
•
Granted: 1963-01-15
•
Expires: 1980-05-19
Abstract
No abstract record available.
Inventors
- 👤 Hadley David James
- 👤 Stewart David Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:29
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34; Y; Y10; Y10S; Y10S203/00; Y10S203/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
THE PROCESS FOR THE REMOVAL OF HYDROGEN CYANIDE FROM A MIXTURE OF ACRYLONITRILE, HYDROGEN CYANIDE, ACROLEIN AND WATER WHICH COMPRISES DISTILLING THEE MIXTURE, TAKING OFF OVERHEAD AN AZEOTROPE IN VAPOR FORM OF ACRYLONITRILE AND WATER, CONTAINING ALSO ACROLEIN AND HYDROGEN CYANIDE, FEEDING THE OVERHEAD FRACTION IN THE VAPOR PHASE, WITHOUT COOLING, TO A SECOND STILL, SEPARATING THE HYDROGEN CYANIDE OVERHEAD AS A GAS AND RECOVERING ACRYLONITRILE WITH ACROLEIN, BUT SUBSTANTIALLY FREE FROM HYDROGEN CYANIDE, AS BASE PRODUCT.
Claim 2
Dependent Claim
77 words
THE PROCESS FOR THE REMOVAL OF HYDROGEN CYANIDE FROM A MIXTURE OF ACRYLONITRILE, HYDROGEN CYANIDE, ACROLEIN AND WATER WHICH COMPRISES DISTILLING THEE MIXTURE, TAKING OFF OVERHEAD AN AZEOTROPE IN VAPOR FORM OF ACRYLONITRILE AND WATER, CONTAINING ALSO ACROLEIN AND HYDROGEN CYANIDE, FEEDING THE OVERHEAD FRACTION IN THE VAPOR PHASE, WITHOUT COOLING, TO A SECOND STILL, SEPARATING THE HYDROGEN CYANIDE OVERHEAD AS A GAS AND RECOVERING ACRYLONITRILE WITH ACROLEIN, BUT SUBSTANTIALLY FREE FROM HYDROGEN CYANIDE, AS BASE PRODUCT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |