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US4976861A
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Method for determining the wetting characteristic of a porous medium
Assignee: Pall Corp
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Filing: 1990-03-02
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Granted: 1990-12-11
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Expires: 2010-03-02
Abstract
Abstract This invention provides a method for determining the wetting characteristic of a porous medium comprising applying at least one or more drops of each of at least two different liquids having different but closely spaced surface tensions to different locations on the porous medium and if necessary repeating the process until, of two liquids with neighboring surface tension, one is absorbed into the medium, and the other is not.
Inventors
- 👤 David B. Pall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:41
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; A; A61; A61M; A61M1/00; A61M1/36; A61M1/3621; A61M1/3627; A61M1/3633; B01D39/02; B01D39/04; A61M2202/00; A61M2202/04; A61M2202/0413; A61M2202/0439; Y; Y10; Y10S; Y10S210/00; Y10S210/918
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
67 words
A method for determining the wetting characteristic of a porous medium comprising applying at least one or more drops of each of at least two different liquids having different but closely spaced surface tensions to different locations on the porous medium and if necessary repeating of this process until, of two liquids with neighboring surface tension, one is absorbed into the medium, and the other is not.
Claim 2
Independent Claim
67 words
A method for determining the wetting characteristic of a porous medium comprising applying at least one or more drops of each of at least two different liquids having different but closely spaced surface tensions to different locations on the porous medium and if necessary repeating of this process until, of two liquids with neighboring surface tension, one is absorbed into the medium, and the other is not.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said at least two different liquids have surface tensions varying in a sequential manner by 2 to 4 dynes/cm.--;
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein the different liquids exhibit surface tensions in the range of from about 13 to about 110 dynes/cm.--;
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein ten drops each of said at least two different liquids are applied to different locations on the porous medium.--;
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein said porous medium comprises a synthetic resin.--;
Claim 7
Dependent Claim
22 words
The method for determining the wetting characteristic of a porous medium of claim 5 wherein said porous medium comprises a fibrous material.--;
Claim 8
Dependent Claim
25 words
The method of claim 6 wherein said porous medium has a CWST in the range of from greater than 53 to less than 90 dynes/cm.--.
References Cited (Backward Citations)
US1561285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |