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. 22, 1983
Filed:
May. 13, 1981
Applicant:
Inventors:
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01C / ;
U.S. Cl.
CPC ...
338 21 ;
Abstract
A lead germante phase, (Pb.sub.5 Ge.sub.3 O.sub.11) is added to a ceramic sintered body formed from a polycrystalline alkaline earth metal titanate which has been doped with a small quantity of metal oxide to produce a N-type conductivity. A thin insulating layer of this germante is formed at the grain boundaries of the polycrystalline semiconducting alkaline earth metal titanate because of the formation of a liquid phase during sintering. Thus, the varistor effect is immediately available in the overall volume of the resistance body and need not first be induced by means of a forming procedure, as is the case for known resistors formed from N-doped barium titanate.