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:
Aug. 16, 1994
Filed:
Oct. 13, 1993
Juji Ishigame, Hamura, JP;
Yoshiaki Matsumura, Oume, JP;
Sumitomo Metal Mining Company, Limited, Tokyo, JP;
Abstract
A ceramic substrate sintered at low temperature comprising: 20 to 50% by volume of an anorthite (CaAl.sub.2 Si.sub.2 O.sub.8) crystal phase, 1 to 20% by volume of a gahnite (ZnAl.sub.2 O.sub.4) crystal phase and the balance of a glass phase and, further, containing 35 to 50% by weight of alumina (Al.sub.2 O.sub.3) as a filler. Since the substrate can be sintered at a temperature lower than 900.degree. C., has a mechanical strength as large as more than 2500 kgf/cm.sup.2 and a thermal expansion coefficient of less than 60.times.10.sup.-7 /.degree.C., Au Ag and Cu can be used as a conductor and the substrate can be used like that existent alumina substrate.