US3723754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-thrombogenic articles
Assignee: Kureha Corp
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Filing: 1971-08-27
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Granted: 1973-03-27
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Expires: 1991-08-27
Abstract
Abstract A non-thrombogenic article comprising: an electret having a stable heterocharge, prepared by decaying away the unstable heterocharge and homocharge of an electret, which is produced from a polymer in a conventional manner, said article being such that the negative-charge bearing surface of said electret forms the surface of the article to be brought into contact with the blood.
Inventors
- 👤 N Murayama
- 👤 M Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:29
CPC Classifications
A; A61; A61L; A61L33/00; A61L33/0094
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
60 words
A non-thrombogenic article comprising: an electret havIng a stable heterocharge, prepared by decaying away with water or heat the unstable heterocharge and homocharge of an electret, which is produced from a polar polymer in a conventional manner, said article being such that the negative-charge bearing surface of said electret forms the surface of the article brought into contact with blood.
Claim 2
Dependent Claim
60 words
A non-thrombogenic article comprising: an electret havIng a stable heterocharge, prepared by decaying away with water or heat the unstable heterocharge and homocharge of an electret, which is produced from a polar polymer in a conventional manner, said article being such that the negative-charge bearing surface of said electret forms the surface of the article brought into contact with blood.
Claim 3
Dependent Claim
23 words
The non-thrombogenic article of claim 1, wherein the unstable heterocharge and homocharge of the original electret are decayed away by heat-treating the electret.
Claim 4
Dependent Claim
28 words
The non-thrombogenic article of claim 1, wherein the unstable heterocharge and homocharge of said original electret are decayed away by treating the electret in the presence of water.
Claim 5
Dependent Claim
33 words
The non-thrombogenic article of claim 1, wherein said polar polymer is a member selected from the group consisting of polyvinylidene fluoride, polyvinylidene chloride, acrylic resins, polyesters, copolymers of said polymers and mixtures thereof.
References Cited (Backward Citations)
US3660736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |