Patent US3196178A successfully refreshed from Google Patents.
US3196178A
Expired / Lapsed
US
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Process for purifying acrylamide or alpha-methacrylamide
Assignee: Rohm and Haas Co
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Filing: 1962-03-28
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Granted: 1965-07-20
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Expires: 1982-03-28
Abstract
No abstract record available.
Inventors
- 👤 Everett J Kelley
- 👤 Herbert R Moody
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:59
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/02; C07C233/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS FOR PURIFYING AN AMIDE SELECTED FROM THE CLASS CONSISTING OF ACRYLAMIDE AND A-METHACRYLAMIDE COMFROM AND THEN CONTACTING SAID VAPORS WITH AN INERT, ORGANIC LIQUID WHEREIN NOT MORE THAN ABOUT 5% OF SAID AMIDE DISSOLVES IN SAID LIQUID AT THE CONTACTING TEMPERATURE, SAID CONTACTING TEMPERATURE BEING BELOW THE MELTING POINT OF SAID AMIDE, WHEREBY SAID AMIDE IS OBTAINED FROM SAID VAPORS SUBSTANTIALLY DIRECTLY AS A FINELY DIVIDED SOLID IN SAID LIQUID.
Claim 2
Dependent Claim
72 words
A PROCESS FOR PURIFYING AN AMIDE SELECTED FROM THE CLASS CONSISTING OF ACRYLAMIDE AND A-METHACRYLAMIDE COMFROM AND THEN CONTACTING SAID VAPORS WITH AN INERT, ORGANIC LIQUID WHEREIN NOT MORE THAN ABOUT 5% OF SAID AMIDE DISSOLVES IN SAID LIQUID AT THE CONTACTING TEMPERATURE, SAID CONTACTING TEMPERATURE BEING BELOW THE MELTING POINT OF SAID AMIDE, WHEREBY SAID AMIDE IS OBTAINED FROM SAID VAPORS SUBSTANTIALLY DIRECTLY AS A FINELY DIVIDED SOLID IN SAID LIQUID.
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) | 1968-07-19 | 1969-01-18 | 1969-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-19 | 1973-01-18 | 1973-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-19 | 1977-01-18 | 1977-07-20 | $7700.00 | Window Closed / Lapsed |