US4387183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thromboresistant molded article and method for its production
Assignee: Lyondell Chemical Technology LP
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Filing: 1981-10-16
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Granted: 1983-06-07
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Expires: 2001-10-16
Abstract
Abstract A molded article which consists of a core comprising a copolymer of a monovinyl aromatic monomer and an alpha, beta-unsaturated cyclic anhydride and a grafted water-swollen hydrophilic polymer coating on the core is particularly suitable for use as a blood-contacting article.
Inventors
- 👤 Peter S. Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:55
CPC Classifications
A; A61; A61J; A61J1/00; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/056; C08J2325/00; C08J2325/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A method of treating the surface of a molded article, produced from a molding composition comprising a copolymer of a monovinyl aromatic monomer and an alpha, beta-unsaturated cyclic anhydride, to render the surface thromboresistant, which method comprises: (a) grafting hydrophilic polymer chains on at least a portion of the anhydride groups on the copolymer at the surface of the molded article, the amount of grafting being sufficient to render the surface of the molded article thromboresistant upon subsequent contact with water, and (b) contacting the hydrophilic polymer with water for a period sufficient to swell the polymer and render the surface of the molded article thromboresistant.
Claim 2
Independent Claim
106 words
A method of treating the surface of a molded article, produced from a molding composition comprising a copolymer of a monovinyl aromatic monomer and an alpha, beta-unsaturated cyclic anhydride, to render the surface thromboresistant, which method comprises: (a) grafting hydrophilic polymer chains on at least a portion of the anhydride groups on the copolymer at the surface of the molded article, the amount of grafting being sufficient to render the surface of the molded article thromboresistant upon subsequent contact with water, and (b) contacting the hydrophilic polymer with water for a period sufficient to swell the polymer and render the surface of the molded article thromboresistant.
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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) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |