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US3886057A Expired / Lapsed US ⏱️ 0.0 years remaining

Cell useful for determining water vapor transmission rate or water content

Assignee: Dow Chemical Co
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Filing: 1971-02-01
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Granted: 1975-05-27
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Expires: 1991-02-01
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Abstract

Abstract A cell for absorbing and electrolyzing the water vapor transmitted from a sample used in an apparatus for rapidly determining the water vapor transmission rate through plastic films or like structures and water content in solid, liquid and gaseous materials wherein electrolysis of the water vapor from a test sample takes place in a cell electrolysis assembly comprising a first electrode support and a first electrode and a second electrode support and a second electrode with a foraminous matrix having an electrically conductive water absorption material therein disposed electrically between the first and second electrodes. The water vapor transmission rate or water content of the sample can be rapidly and accurately determined by quantitative mass spectrometer calculations of the oxygen and hydrogen generated during electrolysis or by calculation of the electrical current needed to electrolyze the water vapor which are related with primary accuracy.

Inventors

  • 👤 Roger L Bredeweg

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 05:43
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/42; G01N27/423

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 256 words
A CELL FOR ABSORBING AND ELECTROLYZING WATER VAPOR TRANSMITTED FROM A SAMPLE USED IN AN APPARATUS FOR RAPIDLY DETERMINING THE WATER VAPOR TRANSMISSION RATE THROUGH PLASTIC FILMS OR LIKE STRUCTURES AND WATER CONTENT OF SOLID, LIQUID OR GASEOUS MATERIALS, THE CELL COMPRISING; A HOLLOW BODY DEFINING AN INTERIOR SPACE, A REMOVABLE CLOSURE ADJACENT SAID INTERIOR SPACED FOR SEALABLY CLOSING SAID HOLLOW BODY, A SAMPLE SUPPORT DISPOSED WITHIN SAID INTERIOR SPACE, AND ELECTROLYSIS SANDWICH STRUCTURE COMPRISING A FIRST ELECTRODE SUPPORT AND A FIRST ELECTRODE AND A SECOND ELECTRODE SUPPORT AND A SECOND ELECTRODE WITH A FIBROUS MATRIX IMPREGNATED WITH AN ELECTRICALLY CONDUCTIVE WATER ABSORPTION MATERIAL DISPOSED ELECTRICALLY BETWEEN SAID FIRST AND SECOND ELECTRODE, ONE SAID ELECTRODE SUPPORTS AND ELECTRODES SEPARATING SAID FIBROUS MATRIX FROM SAID INTERIOR SPACE AND HAVING AT LEAST ONE PASSAGEWAY PROVIDING OPEN COMMUNICATION BETWEEN SAID INTERIOR SPACE AND SAID FIBROUS MATRIX THROUGH WHICH SAID WATER VAPOR IS TRANSPORTED INTO SAID FIBROUS MATRIX, SAID CELL HAVING AT LEAST ONE FIRST ELONGATED HOLLOW PROVIDING OPEN COMMUNICATION BETWEEN SAID INTERIOR SPACE AND THE EXTERIOR OF SAID CELL AND AT LEAST ONE SECOND ELONGATED HOLLOW PROVIDING OPEN COMMUNICATION BETWEEN SAID INTERIOR SPACE AND THE EXTERIOR OF SAID CELL AND AT LEAST ONE SECOND ELONGATED HOLLOW PROVIDING OPEN COMMUNICATION BETWEEN SAID FIBROUS MATRIX AND THE EXTERIOR OF SAID CELL THROUGH WHICH OXYGEN AND HYDROGEN GENERATED BY ELECTROLYSIS OF SAID WATER VAPOR IN SAID FIBROUS MATRIX IS TRANSPORTED, AND A RUBBER SEPTUM FOR PASSING A QUANTITY OF WATER INTO SAID INTERIOR SPACE FROM A LOCATION EXTERIOR OF SAID INTERIOR SPACE.
Claim 2
Dependent Claim 256 words
A CELL FOR ABSORBING AND ELECTROLYZING WATER VAPOR TRANSMITTED FROM A SAMPLE USED IN AN APPARATUS FOR RAPIDLY DETERMINING THE WATER VAPOR TRANSMISSION RATE THROUGH PLASTIC FILMS OR LIKE STRUCTURES AND WATER CONTENT OF SOLID, LIQUID OR GASEOUS MATERIALS, THE CELL COMPRISING; A HOLLOW BODY DEFINING AN INTERIOR SPACE, A REMOVABLE CLOSURE ADJACENT SAID INTERIOR SPACED FOR SEALABLY CLOSING SAID HOLLOW BODY, A SAMPLE SUPPORT DISPOSED WITHIN SAID INTERIOR SPACE, AND ELECTROLYSIS SANDWICH STRUCTURE COMPRISING A FIRST ELECTRODE SUPPORT AND A FIRST ELECTRODE AND A SECOND ELECTRODE SUPPORT AND A SECOND ELECTRODE WITH A FIBROUS MATRIX IMPREGNATED WITH AN ELECTRICALLY CONDUCTIVE WATER ABSORPTION MATERIAL DISPOSED ELECTRICALLY BETWEEN SAID FIRST AND SECOND ELECTRODE, ONE SAID ELECTRODE SUPPORTS AND ELECTRODES SEPARATING SAID FIBROUS MATRIX FROM SAID INTERIOR SPACE AND HAVING AT LEAST ONE PASSAGEWAY PROVIDING OPEN COMMUNICATION BETWEEN SAID INTERIOR SPACE AND SAID FIBROUS MATRIX THROUGH WHICH SAID WATER VAPOR IS TRANSPORTED INTO SAID FIBROUS MATRIX, SAID CELL HAVING AT LEAST ONE FIRST ELONGATED HOLLOW PROVIDING OPEN COMMUNICATION BETWEEN SAID INTERIOR SPACE AND THE EXTERIOR OF SAID CELL AND AT LEAST ONE SECOND ELONGATED HOLLOW PROVIDING OPEN COMMUNICATION BETWEEN SAID INTERIOR SPACE AND THE EXTERIOR OF SAID CELL AND AT LEAST ONE SECOND ELONGATED HOLLOW PROVIDING OPEN COMMUNICATION BETWEEN SAID FIBROUS MATRIX AND THE EXTERIOR OF SAID CELL THROUGH WHICH OXYGEN AND HYDROGEN GENERATED BY ELECTROLYSIS OF SAID WATER VAPOR IN SAID FIBROUS MATRIX IS TRANSPORTED, AND A RUBBER SEPTUM FOR PASSING A QUANTITY OF WATER INTO SAID INTERIOR SPACE FROM A LOCATION EXTERIOR OF SAID INTERIOR SPACE.

References Cited (Backward Citations)

US3001918A Cited
US3188283A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-05-26 1978-11-25 1979-05-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-05-26 1982-11-25 1983-05-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-05-26 1986-11-25 1987-05-27 $7700.00 Window Closed / Lapsed

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