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:
Apr. 21, 2009
Filed:
May. 18, 2006
Applicant:
David A. Risk, Heatherton, CA;
Inventor:
David A. Risk, Heatherton, CA;
Assignee:
St. Francis Xavier University, Antigonish, Nova Scotia, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N 1/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
A probe for sampling a soil gas comprising a body having a cavity to which is connected an inlet and an outlet, and a gas permeable waterproof membrane wrapped around the body and sealing the cavity. The membrane allows the soil gas to flow across the membrane from the soil to the cavity. A method for measuring soil gas diffusivity comprising the step of circulating in a closed loop a carrier gas substantially at an atmospheric pressure through a diffusion gas sampling probe inserted in the soil and through a sensor used for the measurement of a concentration of at least a component of the soil gas.