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:
Sep. 21, 1999
Filed:
Nov. 26, 1997
Masashi Fukaya, Kuwana, JP;
Abstract
A ceramic circuit substrate having a resistor deposited on a surface thereof, said ceramic substrate having a coefficient of thermal expansion ranging from 5.0.times.10.sup.-6 /.degree. C. to 7.0.times.10.sup.-6 /.degree. C., the resistor being coated with a glass overcoat and made of 15 to 50% of RuO.sub.2 and 85 to 50% of a CaO--Al.sub.2 O.sub.3 --SiO.sub.2 --B.sub.2 O.sub.3 -system glass, the glass overcoat being made of 60 to 100% of a CaO--Al.sub.2 O.sub.3 --SiO.sub.2 --B.sub.2 O.sub.3 -system glass and up to 40% of alumina, wherein the resistor has a coefficient of thermal expansion greater than that of the glass overcoat. Due to the above specific relationship between the coefficient of thermal expansion of the resistor and that of the overcoat, the resistor is not subject to cracking at the time of trimming and thereafter, and realizes the exertion of resistance performance ensuring excellent weather resistance and stability.