Patent US3133957A successfully refreshed from Google Patents.
US3133957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of acrylonitrile
Assignee: Distillers Co Yeast Ltd
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Filing: 1961-03-17
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Granted: 1964-05-19
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Expires: 1981-03-17
Abstract
No abstract record available.
Inventors
- 👤 Bellringer Frederick James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:53
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS FOR THE SEPARATION OF ACRYLONITIRLE FROM A MIXTURE OF ACRYLONITIRLE AND ACETONITIRLE WHICH COMPRISES EXTRACTING A MIXTURE CONTAINING LESS THAN 18% BY WEIGHT OF ACETONITRILE WITH WATER AND XYLENE, WHEREBY THE ACETONTRILE IS EXTRACTED INTO THE WATER AND ACRYLNITRILE IS EXTRACTED INTO THE XYLENE.
Claim 2
Dependent Claim
46 words
A PROCESS FOR THE SEPARATION OF ACRYLONITIRLE FROM A MIXTURE OF ACRYLONITIRLE AND ACETONITIRLE WHICH COMPRISES EXTRACTING A MIXTURE CONTAINING LESS THAN 18% BY WEIGHT OF ACETONITRILE WITH WATER AND XYLENE, WHEREBY THE ACETONTRILE IS EXTRACTED INTO THE WATER AND ACRYLNITRILE IS EXTRACTED INTO THE XYLENE.
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) | 1967-05-19 | 1967-11-18 | 1968-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-19 | 1971-11-18 | 1972-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-19 | 1975-11-18 | 1976-05-19 | $7700.00 | Window Closed / Lapsed |