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. 24, 2009
Filed:
Jul. 08, 2005
Noah Heller, Corte Madera, CA (US);
Hiroyoki Atsumi, Tokyo, JP;
Masaru Toida, Tokyo, JP;
Toru Chino, Gilroy, CA (US);
Noah Heller, Corte Madera, CA (US);
Hiroyoki Atsumi, Tokyo, JP;
Masaru Toida, Tokyo, JP;
Toru Chino, Gilroy, CA (US);
Besst, Inc., San Rafael, CA (US);
Kajima Corporation, Tokyo, JP;
Abstract
Systems and methods for installation and operation of a groundwater monitoring system in a borehole of any angle using a coaxial gas displacement pump with a unique O-ring assembly that serves as a two-position valve for groundwater purging and sampling and also as a housing and sealing mechanism for isolating an optical pressure sensor. The optical sensor measures in-situ hydraulic pressure directly subjacent and adjacent to the surrounding rock fractures and sediment pores without hydraulic interferences from potentiometric equilibration lag time from recovery fluid pressure inside a borehole, in a zone above the optical sensor, or on the inside of a riser pipe that rises to the ground surface.