US5126181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microporous discs of elastic segmented polyurethane
Assignee: EIDP Inc
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Filing: 1991-09-23
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Granted: 1992-06-30
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Expires: 2011-09-23
Abstract
Abstract Solutions of segmented polyurethanes are coagulated to form flat circular microporous structures having a substantially continuous pore-free surface and a substantially open pore surface.
Inventors
- 👤 Garret D. Figuly
- 👤 Linda H. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:38
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08J9/00; C08J9/28; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S264/00; Y10S264/14; Y10T; Y10T428/00; Y10T428/21; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249989
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A substantially flat, circular, microporous disc consisting essentially of elastic segmented polyurethane having on one side, a substantially non-porous continuous skin and, on the other side, a substantially open pore surface with pore openings of ˜10 to ˜2000 microns, said disc having a diameter of from 1 mm to 6 mm, a thickness of from 0.1 mm to 0.6 mm, a bulk density of from 0.30 to 0.40 g/cm 3 , a total intrusion volume of from 1.0 to 2.0 cm 3 /g and a total pore area of 0.30 to 0.40 m 2 /g, said intrusion volume and pore area values determined by mercury porosimetry.
Claim 2
Dependent Claim
106 words
A substantially flat, circular, microporous disc consisting essentially of elastic segmented polyurethane having on one side, a substantially non-porous continuous skin and, on the other side, a substantially open pore surface with pore openings of ˜10 to ˜2000 microns, said disc having a diameter of from 1 mm to 6 mm, a thickness of from 0.1 mm to 0.6 mm, a bulk density of from 0.30 to 0.40 g/cm 3 , a total intrusion volume of from 1.0 to 2.0 cm 3 /g and a total pore area of 0.30 to 0.40 m 2 /g, said intrusion volume and pore area values determined by mercury porosimetry.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |