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:
Aug. 10, 1993
Filed:
May. 09, 1991
Michael Masia, Redwood City, CA (US);
James P Reed, San Francisco, CA (US);
Robert S Wasley, San Carlos, CA (US);
Larry R Reeder, San Jose, CA (US);
Peter L Brooks, Los Altos, CA (US);
Thomas W Tolles, San Francisco, CA (US);
Louis M Frank, Sunnyvale, CA (US);
Mauro Bonomi, Palo Alto, CA (US);
Ray F Stewart, Redwood City, CA (US);
John Lahlough, San Jose, CA (US);
Lawrence Welsh, Palo Alto, CA (US);
Raychem Corporation, Menlo Park, CA (US);
Abstract
An elongate sensor for detecting and locating presence of a liquid, e.g. water or a hydrocarbon. The sensor includes first and second elongate members which are spaced apart from each other and each of which is a metal conductor covered by a conductive polymer; a third, insulated elongate conductor; and an elongate insulating core. At least one of the elongate members is helically wrapped around the core. Presence of the liquid at any point along the length of the sensor causes the first and second members to be electrically connected at that point, creating a system in which the potential drop down one of the members can be measured and the location of the connection determined.