US3666733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water insoluble hydrophilic polymers of acrylamide polymer
Assignee: KOCH-LIGHT Ltd
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Filing: 1970-03-16
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Granted: 1972-05-30
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Expires: 1990-03-16
Abstract
Abstract This invention relates to hydrophilic water insoluble polymers, their preparation and the attachment of enzyme molecules to said polymers to render said enzymes water insoluble. The polymers comprise chains having attached thereto repeating primary amide side groupings which make said polymer hydrophilic and other repeating functional side groupings at least some of which are either acid hydrazide groupings or aromatic ammo groupings. These chains of the polymers have been cross-linked so as to make the polymer water insoluble by using bisacrylamides as a comonomer.
Inventors
- 👤 Roger Epton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:51
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C12; C12N; C12N11/00; C12N11/02; C12N11/08; C12N11/082; C12N11/087
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
A hydophilic water insoluble copolymer consisting of acrylamide, N,N''-methylene-bis-acrylamide and N-acryloyl-N''-t-butoxy-carbonyl-hydrazine units in a molar ratio of from 20:5:2 to 25:1:2, respectively, said copolymer comprising chains of carbon atoms derived from said repeating acrylamide, N,N''-methylene-bis-acrylamide and N-acryloyl-N''-t-butoxy-carbonyl-hydrazine units, said chains being cross-linked to one another by said N,N''-methylene-bis-acrylamide units so as to make said polymer water insoluble and acid hydrazide groupings derived from said N-acryloyl-N''-t-butoxy-carbonyl-hydrazine units being bonded to carbon atoms in said chains which have been derived from said N-acryloyl-N''-t-butoxy-carbonyl-hydrazine units.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |