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:
Sep. 17, 2019
Filed:
Jun. 01, 2017
Ngk Insulators, Ltd., Nagoya-shi, Aichi, JP;
Taku Okamoto, Nagoya, JP;
Noriko Hirata, Nagoya, JP;
Yuki Nakayama, Nagoya, JP;
Kosuke Monna, Nukata-gun, JP;
NGK INSULATORS, LTD., Nagoya, JP;
Abstract
A mixed-potential type gas sensor capable of preferably determining the concentration of THC including a kind of gas having a large C number is provided. A sensor element composed of an oxygen-ion conductive solid electrolyte is provided with, on its surface, a sensing electrode formed of a cermet of Pt, Au, and an oxygen-ion conductive solid electrolyte, and includes a reference electrode and a porous surface protective layer that covers at least said sensing electrode. An Au abundance ratio on a surface of noble metal particles forming the sensing electrode is 0.3 or more. The surface protective layer has a porosity of 28% to 40%, a thickness of 10 to 50 μm, and an area ratio of a coarse pore having a pore size of 1 μm or larger of 50% or more; or has a porosity of 28% to 40% and a thickness of 10 to 35 μm.