Patent US3061595A successfully refreshed from Google Patents.
US3061595A
Expired / Lapsed
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Polymerization promoter system for water-soluble polymers
Assignee: Wyeth Holdings LLC
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Filing: 1959-11-24
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Granted: 1962-10-30
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Expires: 1979-11-24
Abstract
No abstract record available.
Inventors
- 👤 George H Dorion
- 👤 Burkhard Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:45
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
93 words
A METHOD WHICH COMPRISES POLYMERIZING AND CROSSLINKING AN AQUEOUS SOLUTION OF POLYMERIZABLE MATERIAL COMPRISIING ACRYYLAMIDE AND SODIUM ACRYLATE IN A WEIGHT RATIO OF 1:4 TO 4:1 AND CONTAINING FROM ABOUT 1 TO 10 WEIGHT PERCENT BASED ON THE POLYMERIZABLE MATERIAL OF METHYLENE BISACRYLAMIDE, IN THE PRESENCE OF ABOUT 0.02 WEIGHT PERCENT TO ABOUT 5.0 WEIGHT PERCENT AMMONIUM PERSULFATE AND AS ACTIVATOR THEREFOR FROM ABOUT 0.01 WEIGHT PERCENT TO ABOUT 1.5 WEIGHT PERCENT N,N,N'',N''TETRAMETHYL ETHYLENE DIAMINE THE WEIGHT OF BOTH CATALYST AND ACTIVATOR BASED ON THE TOTAL WEIGHT OF THE SOLUTION OF POLYMERIZABLE MONOMERS.
References Cited (Backward Citations)
US2865177A
Cited
US2893970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-29 | 1966-04-30 | 1966-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-29 | 1970-04-30 | 1970-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-29 | 1974-04-30 | 1974-10-30 | $7700.00 | Window Closed / Lapsed |