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:
Jul. 15, 2003
Filed:
May. 29, 2001
Kenneth John Davey, Bassendean, WA (US);
Structural Monitoring Systems Ltd., West Perth, AU;
Abstract
Apparatus for measuring permeability of a material includes a substantially constant vacuum source coupled via duct to a fluid capacitance vessel which contains pressure transducer coupled by conductors to an amplifier and display for monitoring the source . Fluid impervious disc is provided with placement on surface on the material to define, between disc and surface a fluid flow cavity . Disc is coupled by conduit to a restriction tube which provides a high impedance to fluid flow. An opposite end of the restriction tube is in fluid communication with vessel . A transducer is coupled across restriction tube to provide a measure of fluid flow. Fluid impervious seal forms a seal about the periphery of disc and extends radially outwardly on the surface . Assuming the material has some degree of permeability, air will be able to permeate through the material from beyond the periphery of the seal and to the cavity . This flow produces a steady state of pressure differential across the tube which is detected by transducer and which can be read from display , to provide a measure of permeability.