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:
Jul. 17, 1984
Filed:
Oct. 21, 1982
Applicant:
Inventors:
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 80 ; 428446 ; 428699 ; 428701 ; 428702 ;
Abstract
A ceramic substrate, suitable for use as a circuit substrate on which integrated circuit chips are bonded, which consists essentially of, based on the weight of the substrate, 0.5.about.5.0% by weight of MgO, and 95.0.about.99.5% by weight of the total of Al.sub.2 O.sub.3 and SiO.sub.2, the proportion of the Al.sub.2 O.sub.3 to the SiO.sub.2 being in the range from 50:50 to 80:20 by weight.