Patent US4379911A successfully refreshed from Google Patents.
US4379911A
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Cross-linking agents for cationic polymers
Assignee: Wyeth Holdings LLC
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Filing: 1982-07-29
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Granted: 1983-04-12
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Expires: 2002-07-29
Abstract
Abstract Amino-formaldehyde products with activated carboxylic ester groups cross-link compounds containing pendant primary or secondary amine groups.
Inventors
- 👤 Girish G. Parekh
- 👤 Werner J. Blank
- 👤 Peter J. Schirmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:54
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3467; C08K5/3477; C08K5/3492; C08K5/34922; C08G; C08G12/00; C08G12/02; C08G12/40; C08G12/44; C09; C09D; C09D201/00; C09D201/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31688; Y10T428/31942
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
43 words
A cross-linking agent for compounds containing an average of at least two primary or secondary amine groups per molecule, comprising a melamine compound, the amine groups of which contain as substituents an average of at least two glyoxylic acid ester groups per molecule.
Claim 2
Dependent Claim
43 words
A cross-linking agent for compounds containing an average of at least two primary or secondary amine groups per molecule, comprising a melamine compound, the amine groups of which contain as substituents an average of at least two glyoxylic acid ester groups per molecule.
Claim 3
Dependent Claim
17 words
A cross-linking agent according to claim 1 wherein the melamine compounds is methyl melamine glycolate methyl ether.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-11 | 1986-10-11 | 1987-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-11 | 1990-10-11 | 1991-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-11 | 1994-10-11 | 1995-04-12 | $7700.00 | Window Closed / Lapsed |