US3876594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing of articles from hydrophilic polymers appropriate for repeated or long-term contact with living tissue or mucous membrane
Assignee: Czech Academy of Sciences
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Filing: 1972-08-17
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Granted: 1975-04-08
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Expires: 1992-08-17
Abstract
Abstract Method for producing articles suitable for repeated or long-term contact with living tissue or mucous membrane and which comprise hydrophilic polymers made by the polymerization of one addition monomer or at least two addition monomers with a small amount of crosslinking agent either with or without solvent. Heterocyclic compounds containing at least one > NH group in the molecule with hydrogen atom substituted by CH.sub.2 =CH--CO-- group are used as the main monomers in the polymerization charge, representing at least 50% of the monomeric charge.
Inventors
- 👤 Drahoslav Lim
- 👤 Jindrich Kopecek
- 👤 Hedvika Bazilova
- 👤 Jiri Vacik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:27
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/14; A61L27/16; A61L29/00; A61L29/04; A61L29/041; C; C08; C08F; C08F26/00; C08F26/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A METHOD FOR PRODUCING NON-SOLUBLE SHAPED ARTICLES OF HYDROPHILIC POLYMERS SUITABLE FOR REPETITIVE OR LONG TERM CONTACT WITH LIVING TISSUE OR MUCOUS MEMBRANE COMPRISING THE STEPS OF CHARGING A MOLD OF SUITABLE CONFIGURATION WITH A MONOMER MIXTURE COMPRISING AT LEAST ONE ADDITION POLYMERIZABLE MONOMER, SAID ONE ADDITION POLYMERIZABLE MONOMER MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF NACRYLOYLMORPHOLINE, N-ACRYLOYLPIPERIDINE, NACRYLOYLTHIOMORPHOLINE AND N-ACRYLOYLPHRROLIDINE AND IS PRESENT IN AN AMOUNT OF AT LEAST ABOUT 50 MOLE PERCENT, MIXING A POLYETHYLENICALLY ORGANIC CROSS-LINKING AGENT WITH THE MONOMER MIXTURE, CONTACTING THE MIXTURE WITH A FREE RADICAL INITIATING SYSTEM AT POLYMERIZATION TEMPERATURE, POLYMERIZING THE MIXTURE IN SAID MOLD UNTIL POLYMERIZATION IS SUBSTANTIALLY COMPLETE AND THEREAFTER WASHING SAID ARTICLE IN WATER.
Claim 2
Independent Claim
115 words
A METHOD FOR PRODUCING NON-SOLUBLE SHAPED ARTICLES OF HYDROPHILIC POLYMERS SUITABLE FOR REPETITIVE OR LONG TERM CONTACT WITH LIVING TISSUE OR MUCOUS MEMBRANE COMPRISING THE STEPS OF CHARGING A MOLD OF SUITABLE CONFIGURATION WITH A MONOMER MIXTURE COMPRISING AT LEAST ONE ADDITION POLYMERIZABLE MONOMER, SAID ONE ADDITION POLYMERIZABLE MONOMER MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF NACRYLOYLMORPHOLINE, N-ACRYLOYLPIPERIDINE, NACRYLOYLTHIOMORPHOLINE AND N-ACRYLOYLPHRROLIDINE AND IS PRESENT IN AN AMOUNT OF AT LEAST ABOUT 50 MOLE PERCENT, MIXING A POLYETHYLENICALLY ORGANIC CROSS-LINKING AGENT WITH THE MONOMER MIXTURE, CONTACTING THE MIXTURE WITH A FREE RADICAL INITIATING SYSTEM AT POLYMERIZATION TEMPERATURE, POLYMERIZING THE MIXTURE IN SAID MOLD UNTIL POLYMERIZATION IS SUBSTANTIALLY COMPLETE AND THEREAFTER WASHING SAID ARTICLE IN WATER.
References Cited (Backward Citations)
US2893970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |