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. 19, 2013
Filed:
May. 11, 2009
Seiji Ohya, Aichi, JP;
Tomohiro Wakazono, Konan, JP;
Kenji Kato, Nagoya, JP;
Koji Shiotani, Kasugai, JP;
Seiji Ohya, Aichi, JP;
Tomohiro Wakazono, Konan, JP;
Kenji Kato, Nagoya, JP;
Koji Shiotani, Kasugai, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A gas sensor including a gas sensor element having a first measurement chamber (); a first pumping cell (); a second measurement chamber () into which a gas to be measured having a controlled oxygen partial pressure is introduced; and a second pumping cell () having a second inner pump electrode () and a second counterpart electrode () pump electrode configured to detect a specific gas component. The second inner pump electrode is made of a material that contains, as a principal ingredient, two kinds of Pt particles having different particle sizes and whose particle size ratio measured by a sedimentation particle-size distribution ranges from 1.75 to 14.2. A mixing ratio between large Pt particles and small Pt particles has a mass ratio of 10/90 to 50/50. A 10 kHz-1 Hz resistance value across the second pumping cell at 600° C. is 150Ω or less.