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:
Aug. 30, 2005
Filed:
Oct. 15, 2002
Tomohiro Mabuchi, Aichi, JP;
Yoshiaki Kuroki, Aichi, JP;
Shinya Awano, Aichi, JP;
Hiroyuki Hayashi, Aichi, JP;
Kunio Yanagi, Aichi, JP;
Tomohiro Mabuchi, Aichi, JP;
Yoshiaki Kuroki, Aichi, JP;
Shinya Awano, Aichi, JP;
Hiroyuki Hayashi, Aichi, JP;
Kunio Yanagi, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A sensor element including an insulative base (), a heating resistor (), an oxygen pump cell (), an oxygen detection cell (), and a diffusion-chamber-forming member () having a rate-controlling introduction portion () and defining a diffusion chamber () in cooperation with electrodes (), wherein these components have been subjected to simultaneous firing (i.e., cofiring) to form a unitary sensor element. A partition wall (), which extends from the diffusion-chamber-forming member and is made of alumina, is joined to a surface of a solid electrolyte () between two electrodes () of an Ip cell. Preferably, a region within 20 μm from the plane of junction joining the partition wall () to the solid electrolyte () contains no portion whose amount of non-alumina substances exceeds by 2% by mass (by weight) or more the amount of non-alumina substances of the diffusion-chamber-forming member ().