William McKelvey
Home Inspectors in Langhorne, PA
License number
New Jersey 24GI00033600
Issued Date
Mar 10, 2003
Expiration Date
Apr 30, 2007
Category
Home Inspection Advisory Comm
Type
Home Inspector
Address
Address
Langhorne, PA
Professional information
Apparatus And Method For Testing Material Samples For Gas Diffusion Characteristics
US Patent:
5088316, Feb 18, 1992
Filed:
Sep 27, 1989
Appl. No.:
7/413198
Inventors:
William F. McKelvey - Langhorne PA
Jay W. Davis - Clifton CO
Jay W. Davis - Clifton CO
Assignee:
Versar, Inc. - Springfield VA
International Classification:
G01N 1508
US Classification:
73 38
Abstract:
A method and apparatus for testing the gas diffusion characteristics of material samples includes a sealed test chamber in which one or more test cells are placed. A material sample is mounted on one end of a substantially cylindrical test cell. The chamber is then charged to a predetermined pressure and concentration of a test gas, such as radon. Periodically, gas samples are drawn through the other end of the test cell for analysis of test gas concentration, which indicates the capability of the material sample to diffuse, or prevent diffusion of, the test gas. For each test, a desired pressure differential is maintained across the material sample, and also between the chamber interior and ambient.