US2784218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of acrylonitrile
Assignee: Monsanto Chemicals Ltd
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Filing: 1954-12-29
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Granted: 1957-03-05
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Expires: 1974-12-29
Abstract
No abstract record available.
Inventors
- 👤 David W Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:02
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR THE PURIFCATION OF ACRYLONITRILE CONTAINING METHYL VINYL KETONE WHICH COMPRISES TREATING SAID ACRYLONITRILE WITH A MINOR AMOUNT OF AN AQUEOUS SOLUTION OF A SODIUM SULFITE-SULFURIC ACID MIXTURE CONTAINING FIVE PARTS BY VOLUME OF 1-MOLAR SODIUM SULFITE AND ONE PART BY VOLUME OF 1 N SULFURIC ACID BUFFERED TO A PH WITHIN THE RANGE FROM ABOUT 6 TO ABOUT 8.
Claim 2
Dependent Claim
62 words
A PROCESS FOR THE PURIFCATION OF ACRYLONITRILE CONTAINING METHYL VINYL KETONE WHICH COMPRISES TREATING SAID ACRYLONITRILE WITH A MINOR AMOUNT OF AN AQUEOUS SOLUTION OF A SODIUM SULFITE-SULFURIC ACID MIXTURE CONTAINING FIVE PARTS BY VOLUME OF 1-MOLAR SODIUM SULFITE AND ONE PART BY VOLUME OF 1 N SULFURIC ACID BUFFERED TO A PH WITHIN THE RANGE FROM ABOUT 6 TO ABOUT 8.
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) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |