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:
Nov. 14, 2017
Filed:
Apr. 05, 2016
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A fluid state detection apparatus which can detect a short failure in which a constituent Wheatstone bridge circuit is shorted to a power supply. A combustible gas detection apparatus () judges that a short failure has occurred in a constant temperature control circuit () (S) when a top potential Vis equal to or greater than a first judgment value Vthand a difference D(=V−V) is equal to or greater than a second judgment value Vth. As a result, apparatus () can distinguish 'a state in which a bridge circuit () is shorted to a DC power supply () (where the constant temperature control circuitis in a short failure state)' from 'a state in which the resistance of the heat generation resistor () deceases due to a combustible gas (hydrogen)' based on the top potential Vand the difference D