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. 09, 1993
Filed:
Mar. 11, 1992
Applicant:
Inventors:
Hideaki Ninomiya, Tokyo, JP;
Toshinobu Miyakoshi, Funabashi, JP;
Ryoichi Kondo, Narita, JP;
Takashi Kamiya, Narita, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C03C / ; C03C / ;
U.S. Cl.
CPC ...
501 32 ; 501 17 ; 501 75 ; 501 77 ;
Abstract
An overcoating inorganic composition is applied to a ceramic substrate for forming an overcoat thereon which has improved flexural strength, matches in thermal expansion with the substrate, and is reliable in that it is free of a crack and causes no variation in the resistance of thick film resistors even under rigorous service conditions. The overcoating inorganic composition contains 70-90% by volume of an inorganic glass component and 10-30% by volume of mullite powder and has a coefficient of thermal expansion in the range of from 50.times.10.sup.-7 to 75.times.10.sup.7 /.degree. C.