US3755280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying of acrylamide polymer gels
Assignee: Wyeth Holdings LLC
•
Filing: 1971-03-05
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Granted: 1973-08-28
•
Expires: 1991-03-05
Abstract
Abstract The detoxification of monomeric acrylamide in aqueous polyacrylamide gels containing redox catalyst residuum is accomplished by the addition of less than 2/3 mol of a watersoluble non-toxic sulfite per mol of monomeric acrylamide present. The acrylamide is detoxified by conversion to polymer form.
Inventors
- 👤 K Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:36
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/006; C08F265/00; C08F265/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
31 words
A process according to claim 1 wherein the amount of sulfite which is incorporated in said gel is between 0.01 and 0.1 mol per mol of acrylamide monomer in said gel.
Claim 2
Dependent Claim
18 words
A process according to claim 1 wherein the sulfite which is incorporated in said gel is sodium bisulfite.
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein the gel is dried at a temperature between about 160* F. and 212* F.
References Cited (Backward Citations)
US2960486A
Cited
US3480761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |