Patent US3639141A successfully refreshed from Google Patents.
US3639141A
Expired / Lapsed
US
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Heparinization of plastic
Assignee: Cordis Corp
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Filing: 1968-09-16
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Granted: 1972-02-01
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Expires: 1988-09-16
Abstract
Abstract Plastics are rendered nonthrombogenic by heparinizing them following a treatment with an amino alkyl tri alkoxy silane in an inert solvent. The solvent is preferably one capable of swelling the plastic. In the treatment of fluorocarbon plastics, a preliminary treatment with sodium is employed. The amino groups which become attached to the plastic are thus caused to bond heparin to the surface effectively to impart anticoagulating properties.
Inventors
- 👤 Manfred F Dyck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:08
CPC Classifications
A; A61; A61L; A61L33/00; A61L33/0005; A61L33/0011; A61L33/0023
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
16 words
The method defined by claim 1 wherein the silane is (CH3)3 Si (CH2)3 NH (CH2)2 NH2.
References Cited (Backward Citations)
US3512915A
Cited
US3475410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |