US4862730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Test method for determination of moisture vapor transmission rate
Assignee: W.L. Gore and Associates Inc
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Filing: 1988-10-03
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Granted: 1989-09-05
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Expires: 2008-10-03
Abstract
Abstract A method is described for determining the degree of moisture vapor transmission of certain materials which comprises taking a weighed test cup containing a saturated salt solution sealed inside the cup with a waterproof, moisture vapor permeable membrane, and inserting it over a sample that is supported on a waterproof, moisture vapor permeable membrane over a controlled temperature waterbath. After a set time, the cup is reweighed and the water pick up recorded.
Inventors
- 👤 Philip M. Crosby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:55
CPC Classifications
G; G01; G01N; G01N5/00; G01N5/02; G01N13/00; G01N13/04; G01N15/00; G01N15/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
153 words
A method for determining the degree of moisture vapor transmission of certain materials that transmit water in amounts that affect moisture vapor transmission values, which comprises, in sequence: (i) placing a sample of the material onto a waterproof, moisture vapor permeable membrane in a support on a controlled temperature water bath held at a temperature that is substantially the same as the test environment, (ii) inverting a weighed test cup which contains a saturated salt solution and is sealed with a waterproof, moisture vapor permeable membrane onto the sample, said salt having an equilibrium relative humidity higher than that of the atmosphere in which the method is carried out, and in which a solution of the salt is free flowing at ambient conditions, (iii) after a predetermined time, weighing the cup and recording the water pickup over the weight of the cup prior to step ii, (iv) determining the moisture vapor transmission rate.
Claim 2
Independent Claim
153 words
A method for determining the degree of moisture vapor transmission of certain materials that transmit water in amounts that affect moisture vapor transmission values, which comprises, in sequence: (i) placing a sample of the material onto a waterproof, moisture vapor permeable membrane in a support on a controlled temperature water bath held at a temperature that is substantially the same as the test environment, (ii) inverting a weighed test cup which contains a saturated salt solution and is sealed with a waterproof, moisture vapor permeable membrane onto the sample, said salt having an equilibrium relative humidity higher than that of the atmosphere in which the method is carried out, and in which a solution of the salt is free flowing at ambient conditions, (iii) after a predetermined time, weighing the cup and recording the water pickup over the weight of the cup prior to step ii, (iv) determining the moisture vapor transmission rate.
Claim 3
Dependent Claim
11 words
The method of claim 1 where the material is clothing textiles.
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |