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:
Oct. 21, 2003
Filed:
Sep. 17, 1999
Satoshi Sugaya, Nagoya, JP;
Norihiko Nadanami, Nagoya, JP;
Noboru Ishida, Nagoya, JP;
Takafumi Oshima, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A gas sensor having a laminate structure composed of thin sheets of solid electrolyte and including a cavity portion and an oxygen concentration cell The oxygen concentration in the cavity portion is held constant. The oxygen concentration cell includes an active electrode having a relatively high catalytic capability with respect to NOx or combustible gas and an inner common electrode (serving as an inactive electrode and an oxygen-concentration-sensing electrode) having a relatively low catalytic capability with respect to NOx or combustible gas. The oxygen concentration cell is disposed in the gas sensor so as to be exposed to the interior of the cavity portion The concentration of NOx or combustible gas is determined based on an electromotive force (of the order of mV) generated between the active electrode and the inner common electrode by a concentration cell effect.