Patent US2878166A successfully refreshed from Google Patents.
US2878166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining of acrylonitrile
Assignee: Union Carbide Corp
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Filing: 1956-09-28
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Granted: 1959-03-17
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Expires: 1976-09-28
Abstract
No abstract record available.
Inventors
- 👤 Jesse T Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:49
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
PROCESS FOR RECOVERING ACRYLONITRILE FROM ACRYLONITRILE CONTAMINATED WITH DIVINYLACETYLENE WHICH COMPRISES VAPORIZING SAID CONTAMINATED ACRYLONITRILE UNDER DISTILLATION CONDITIONS WHILE COUNTERCURRENTLY CONTACTING SAID VAPORS WITH WATER SO AS TO REPRESS DISTILLATION OF THE MAJOR PORTION OF THE ACRYLONITRILE WHILE PERMITTING DISTILLATION OF THE DIVINYLACETYLENE WHEREBY THE DIVINYLACETYLENE IS REMOVED IN A DISTILLATE COMPRISING WATER, ACRYLONITRILE AND DIVINYLACETYLENE, AND THE RESIDUE REMAINING COMPRISES AN AQUEOUS SOLUTION OF ACRYLONITRILE SUBSTANTIALLY FREE OF DIVINYLACETYLENE, AND RECOVERING ACRYLONITRILE FROM SAID RESIDUE.
Claim 2
Dependent Claim
76 words
PROCESS FOR RECOVERING ACRYLONITRILE FROM ACRYLONITRILE CONTAMINATED WITH DIVINYLACETYLENE WHICH COMPRISES VAPORIZING SAID CONTAMINATED ACRYLONITRILE UNDER DISTILLATION CONDITIONS WHILE COUNTERCURRENTLY CONTACTING SAID VAPORS WITH WATER SO AS TO REPRESS DISTILLATION OF THE MAJOR PORTION OF THE ACRYLONITRILE WHILE PERMITTING DISTILLATION OF THE DIVINYLACETYLENE WHEREBY THE DIVINYLACETYLENE IS REMOVED IN A DISTILLATE COMPRISING WATER, ACRYLONITRILE AND DIVINYLACETYLENE, AND THE RESIDUE REMAINING COMPRISES AN AQUEOUS SOLUTION OF ACRYLONITRILE SUBSTANTIALLY FREE OF DIVINYLACETYLENE, AND RECOVERING ACRYLONITRILE FROM SAID RESIDUE.
References Cited (Backward Citations)
US2782148A
Cited
US2782149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |