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:
Apr. 05, 1988
Filed:
May. 21, 1986
Applicant:
Inventors:
Nobuyuki Ushifusa, Hitachi, JP;
Satoru Ogihara, Hitachi, JP;
Kousei Nagayama, Ibaraki, JP;
Hiroichi Shinohara, Hitachi, JP;
Gyozo Toda, Hino, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05K / ; B32B / ;
U.S. Cl.
CPC ...
361414 ; 29851 ; 174 685 ; 264 61 ; 428137 ; 428209 ; 428446 ; 428702 ; 428901 ; 501128 ;
Abstract
Ceramic insulating substrate layers (1) for a multilayered ceramic wiring circuit board (3) consist essentially of crystals of mullite and sillimanite, non-crystalline silicon dioxide occupying the interstices between the crystals and magnesium oxide dissolved substantially in the crystals in solid solution and have a thermal expansion coefficient of 40-60.times.10.sup.-7 /.degree. C. and a dielectric constant below 6.7.