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:
Apr. 24, 2001
Filed:
Apr. 23, 1999
Applicant:
Inventors:
Chihiro Takahashi, Chiba-ken, JP;
Shigeki Sato, Narita, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C04B 3/5468 ;
U.S. Cl.
CPC ...
C04B 3/5468 ;
Abstract
A method of producing a PTC semiconducting ceramic which entails preparing the calcine of a main composition of barium titanate-based semiconductor containing substantially no Si and having BaTiO,as a main component thereof, preparing additive compositions, Ba,TiSi,O,and Ba,Ti,O,(1≦n≦4,2≦m≦13, n<m), respectively, compounding the calcine of the main composition and the additive compositions and mixing them, and then subjecting them to formal firing. The obtained product exhibits excellent electrical characteristics, which are not influenced by fluctuations in conditions of production.