US4056476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blood filter media
Assignee: Purolator Technologies Inc
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Filing: 1976-09-02
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Granted: 1977-11-01
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Expires: 1996-09-02
Abstract
Abstract An improved blood filter media comprising a woven fabric having a pore size distribution rating of 20 microns and being woven with monofilament yarns in a regular, even-sided twill weave.
Inventors
- 👤 Herman Charles Mouwen
- 👤 William Lauer
- 👤 Steven Louis Weinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:21
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; A; A61; A61M; A61M1/00; A61M1/36; A61M1/3621; A61M1/3627; B01D27/00; B01D27/02; B01D27/08; B01D2239/00; B01D2239/12; B01D2239/1216; B01D2239/1233
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
83 words
In a unit for filtering blood, the improvement comprising an uncalendered, unbonded, woven fabric filter media having a nominal pore size rating of 20 microns, a pore size distribution range of from 17 microns to 23 microns, and woven with monofilament yarns having a yarn diameter of from 30 microns to 36 microns, said media being woven in a two-up and two-down twill weave, whereby the media is stable and retains its nominal pore size rating and pore size distribution range during use.
Claim 2
Dependent Claim
83 words
In a unit for filtering blood, the improvement comprising an uncalendered, unbonded, woven fabric filter media having a nominal pore size rating of 20 microns, a pore size distribution range of from 17 microns to 23 microns, and woven with monofilament yarns having a yarn diameter of from 30 microns to 36 microns, said media being woven in a two-up and two-down twill weave, whereby the media is stable and retains its nominal pore size rating and pore size distribution range during use.
Claim 3
Dependent Claim
24 words
A woven fabric filter media according to claim 1 wherein the monofilament yarns are nylon monofilament yarns having a yarn diameter of 32 microns.
References Cited (Backward Citations)
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US3603354A
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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) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |