Patent US4663969A successfully refreshed from Google Patents.
US4663969A
Expired / Lapsed
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Measuring water vapor transmission through materials
Assignee: Noel Bibby Ltd
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Filing: 1985-08-21
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Granted: 1987-05-12
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Expires: 2005-08-21
Abstract
Abstract The method and apparatus for testing the vapor transmission characteristics of a sheet material which comprises disposing said material at an interface between an aqueous solution and a plenum chamber, maintaining the temperature of the solution at a predetermined level, maintaining the temperature and humidity in the plenum chamber at a predetermined level and measuring the chamge in concentration of the solute in the solution over a predetermined period of time.
Inventors
- 👤 Noel Bibby
- 👤 John Owens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:28
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; G01N33/00; G01N33/36; G01N33/367
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
87 words
Apparatus for testing the vapor transmission characteristics of a sheet material comprising an open-topped test chamber for receiving an aqueous solution containing a solute, means for measuring a change in concentration of the solute in the solution, sheet material securing means adjacent said open top of said test chamber such that said sheet material substantially completely covers said open top of said test chamber, a heating chamber in which said test chamber is located and a plenum chamber located above said open top of said test chamber.
Claim 2
Dependent Claim
87 words
Apparatus for testing the vapor transmission characteristics of a sheet material comprising an open-topped test chamber for receiving an aqueous solution containing a solute, means for measuring a change in concentration of the solute in the solution, sheet material securing means adjacent said open top of said test chamber such that said sheet material substantially completely covers said open top of said test chamber, a heating chamber in which said test chamber is located and a plenum chamber located above said open top of said test chamber.
Claim 3
Dependent Claim
20 words
Apparatus according to claim 1 in which said heating chamber is a water bath with a thermostatically controlled heating means.
Claim 4
Dependent Claim
17 words
Apparatus according to claim 1 in which an air conditioning unit is connected to said plenum chamber.
Claim 5
Dependent Claim
17 words
Apparatus according to claim 2 in which an air conditioning unit is connected to said plenum chamber.
Claim 6
Dependent Claim
25 words
Apparatus according to claim 1 in which the means for measuring the change in concentration of the solute in the solution is conductivity measuring means.
Claim 7
Dependent Claim
18 words
Apparatus according to claim 1 including means for maintaining a constant level of solution in the test chamber.
Claim 8
Dependent Claim
39 words
Apparatus according to claim 1 in which the means for measuring the change in concentration of the solute in the solution is conductivity measuring means and including means for maintaining a constant level of solution in the test chamber.
Claim 9
Independent Claim
82 words
A method of testing the vapour transmission characteristics of a sheet material which comprises disposing said material at an interface between an aqueous solution containing a solute and a plenum chamber, maintaining the temperature of the solution at a predetermined level, maintaining the temperature and humidity in the plenum chamber at a predetermined level and measuring a change in concentration of the solute in the solution over a predetermined period of time and computing the vapour transmission characteristics from the measurement obtained.
Claim 10
Independent Claim
82 words
A method of testing the vapour transmission characteristics of a sheet material which comprises disposing said material at an interface between an aqueous solution containing a solute and a plenum chamber, maintaining the temperature of the solution at a predetermined level, maintaining the temperature and humidity in the plenum chamber at a predetermined level and measuring a change in concentration of the solute in the solution over a predetermined period of time and computing the vapour transmission characteristics from the measurement obtained.
Claim 11
Dependent Claim
29 words
A method according to claim 8 in which the solution is an electrolyte and the change in concentration is measured by measuring a change in conductivity of the solution.
Claim 12
Dependent Claim
14 words
A method according to claim 9 in which the solution is a saline solution.
Claim 13
Dependent Claim
20 words
A method according to claim 8 in which the predetermined temperature is approximately the blood temperature of a living human.
Claim 14
Dependent Claim
127 words
Apparatus for testing the vapour transmission characteristics of a sheet material comprising an open-topped test chamber for receiving an aqueous solution containing a solute, means for measuring a change in concentration of the solute in the solution, said means being conductivity measuring means, sheet material securing means adjacent said open top of said test chamber such that said sheet material substantially completely covers said open top of said test chamber, a heating chamber in which said test chamber is located, said heating chamber being a water bath with a thermostatically controlled heating means, a plenum chamber located above said open top of said test chamber, an air conditioning unit connected to said plenum chamber and means for maintaining a constant level of solution in the test chamber.
Claim 15
Dependent Claim
127 words
Apparatus for testing the vapour transmission characteristics of a sheet material comprising an open-topped test chamber for receiving an aqueous solution containing a solute, means for measuring a change in concentration of the solute in the solution, said means being conductivity measuring means, sheet material securing means adjacent said open top of said test chamber such that said sheet material substantially completely covers said open top of said test chamber, a heating chamber in which said test chamber is located, said heating chamber being a water bath with a thermostatically controlled heating means, a plenum chamber located above said open top of said test chamber, an air conditioning unit connected to said plenum chamber and means for maintaining a constant level of solution in the test chamber.
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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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |