Patent US3652671A successfully refreshed from Google Patents.
US3652671A
Expired / Lapsed
US
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Process for making a cationic methacrylamide
Assignee: Dow Chemical Co
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Filing: 1970-06-01
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Granted: 1972-03-28
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Expires: 1990-06-01
Abstract
Abstract N-DIALKYLAMINOALKYL)METHACRYLAMIDES ARE PREPARED BY THERMALLY DECOMPOSING THE CORRESPONDING N-(DIALKYLAMINOALKYL)-2-METHYL-B-ALANINE. THE LATTER COMPOUND CAN BE MADE BY REACTING METHACRYLIC ACID WITH AN N,N-DIALKYLALKYLENEDIAMINE. THE SUBSTITUTED METHACRYLAMIDE PRODUCT IS A USEFUL CATIONIC MONOMER FOR MAKING FLOCCULANTS, PAPER PULP ADDITIVES, AND THE LIKE.
Inventors
- 👤 Benny G Barron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:24
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45; D21H17/455; Y; Y10; Y10S; Y10S524/00; Y10S524/922
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |