The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 21, 1995
Filed:
Sep. 27, 1993
Daniel W Mayer, St. Paul, MN (US);
Modern Controls, Inc., Minneapolis, MN (US);
Abstract
A system for measuring the permeability of membranes, particularly with reference to water vapor, utilizing a diffusion cell having a first water vapor chamber and a second gas flow chamber, the chambers being separated by the membrane to be tested. Gas flow through the gas flow chamber is conveyed to an infrared gas analyzer and to a gas flow sensor; the infrared analyzer provides an electrical signal representative of the water vapor content of the gas, and the gas flow sensor provides a signal representative of the rate of gas flow through the system; the analyzer signal is conveyed to an amplifier and the gas flow sensor signal is utilized to adjust the gain of the amplifier, the output of the amplifier thereby presenting a water vapor signal which has been adjusted to compensate for air flow through the system.