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:
Nov. 08, 2011
Filed:
Jun. 26, 2007
Ryouji Nagano, Tokyo, JP;
Yukio Matsuki, Akita, JP;
Seiki Kato, Akita, JP;
Hitoshi Taimatsu, Akita, JP;
Ryouji Nagano, Tokyo, JP;
Yukio Matsuki, Akita, JP;
Seiki Kato, Akita, JP;
Hitoshi Taimatsu, Akita, JP;
Fujikura Ltd., Tokyo, JP;
Abstract
A limiting current type oxygen sensor having a gas diffusion mechanism comprising a gas diffusion bore and an internal space communicating with the gas diffusion bore for supplying a diffusion-rate-determined gas. The gas diffusion mechanism may be configured such that an oxygen concentration gradient within the internal space satisfies the expression:1=(1/4){()+()}based on the Faraday constant (F); a diffusion coefficient (D); an oxygen concentration (C); a bore area (S) of the gas diffusion bore; a bore length (l) in the axial direction of the gas diffusion bore; a distance (l) in the internal space between the first electrode and the inner surface opposed thereto; an effective cross section (S) of the internal space; and an output current value (I). This makes it possible to accurately sense and measure the oxygen concentration, even at low oxygen concentrations, and achieve easy producibility and cost reducibility.