US2628977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing unsaturated amides
Assignee: EIDP Inc
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Filing: 1948-09-17
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Granted: 1953-02-17
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Expires: 1968-09-17
Abstract
No abstract record available.
Inventors
- 👤 William E Grigsby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:14
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/02; C07C233/09
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
54 words
THE PROCESS FOR RECOVERING MONOMERIC ACRYLAMIDE FROM A SULFURIC ACID-HYDROLYSIS MIXTURE CONTAINING PREDOMINATELY ACRYLAMIDE SULFATE, WHICH COMPRISES NEUTRALIZING SAID MIXTURE WITH ANHYDROUS AMMONIA IN THE PRESENCE OF AN ORGANIC SOLVENT FOR ACRYLAMIDE, WHICH IS A NONSOLVENT FOR AMMONIUM SULFATE, SEPARATING THE THUS PRECIPITATED AMMONIUM SULFATE, BY FILTRATION AND RECOVERING MONOMERIC ACRYLAMIDE FROM THE FILTRATE.
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) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |