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. 02, 2010
Filed:
Nov. 24, 2004
Atsushi Sakon, Tokai, JP;
Osamu Nakasone, Inabe, JP;
Kaori Takahashi, Nagoya, JP;
Toshihiko Suzuki, Nagoya, JP;
Atsushi Sakon, Tokai, JP;
Osamu Nakasone, Inabe, JP;
Kaori Takahashi, Nagoya, JP;
Toshihiko Suzuki, Nagoya, JP;
NGK Insulators, Ltd., Nagoya-shi, JP;
Abstract
A gas sensor comprising a first measuring chamber for introducing a gas to be measured, a second measuring chamber for detection of the gas to be measured, and as pump cells a first pump cell having a pair of pump electrodes, and a second pump cell having a measuring electrode and an auxiliary pump electrode, wherein a porous alumina sintered body having communicating pores of 500-1100 Å in average pore diameter and 6-16% in porosity is formed as an electrode protective layer on the surface of at least the measuring electrode of the second pump cell in such a manner that the alumina sintered body covers the measuring electrode. The gas sensor can be use for long period of time because of the protective layer.