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. 16, 1982
Filed:
Jul. 01, 1980
Yoshihiko Nakatani, Osaka, JP;
Masayuki Sakai, Katano, JP;
Seiichi Nakatani, Neyagawa, JP;
Michio Matsuoka, Ibaraki, JP;
Abstract
A combustible gas detecting element, the sensitive element of which has at least one material selected from the group consisting of gamma-type ferric oxide (.gamma.-Fe.sub.2 O.sub.3) and alpha-type ferric oxide (.alpha.-Fe.sub.2 O.sub.3) and has a microstructure with an average grain size smaller than 0.5 micrometers and a porosity of from 35 to 85%. The sensitivity is increased by adding at least one material selected from a group consisting of tin (Sn) and zinc (Zn) in a ratio from 0.5 to 70 mol %, based on stannic oxide (SnO) and zinc oxide (ZnO) relative to the ferric oxide component. The element is manufactured from fine particles obtained by coprecipitating metallic ions from a solution containing Fe ions and at least one member selected from the group consisting of Sn ions and Zn ions, and the fine particles are pressed and then sintered or are formed into a paste, printed on a substrate and then sintered.