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:
Dec. 31, 1991
Filed:
Jun. 14, 1989
Applicant:
Inventors:
Assignee:
Somar Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B / ; H01B / ;
U.S. Cl.
CPC ...
264 61 ; 252518 ; 264 66 ; 419 23 ; 419 38 ; 419 53 ;
Abstract
A process for the production of a varistor material having a nonlinear index (.alpha.) of at least 20, which comprises adding a manganese compound to zinc oxide; heating the obtained mixture in the form of a powder in the atomosphere at 1050.degree. to 1150.degree. C.; grinding the material to give a particle size of 150 mesh or below; molding the powder into a desired shape; and sintering the same at 1200.degree. to 1350.degree. C.; is disclosed.