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:
Dec. 16, 1997
Filed:
Mar. 29, 1996
John M Elliott, Louisville, CO (US);
Jeffrey P Davies, Louisville, CO (US);
Donald L Beduhn, Madison, WI (US);
Ohmeda Inc., Liberty Corner, NJ (US);
Abstract
The thermal time of flight signal guard overcomes the leakage crosstalk problem encountered in prior art systems by eliminating the leakage currents in the flow transducer before they reach the temperature sensors. This is accomplished by the installation of a conductive strip into the fluid flow path, interposed between the temperature sensors and the heat source. The conductive strip intercepts any errant leakage currents that are generated by the heat source and carried by moisture which accumulates on the walls of the fluid flow path to the temperature sensor. The signals that pass through the fluid flow conduit past the conductive strip to the temperature sensors are the thermal tracer signals. Therefore, the temperature sensors operate in a leakage current free environment and the signals produced by the temperature sensors are devoid of leakage current noise.