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:
Jan. 14, 1997
Filed:
Sep. 30, 1994
Kishio Yokouchi, Kawasaki, JP;
Hiroshi Kamezaki, Kawasaki, JP;
Masato Wakamura, Kawasaki, JP;
Nobuo Kamehara, Kawasaki, JP;
Koichi Niwa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A process for producing a multi-layer wiring board having alternate layers of a glass ceramic material and conductor patterns. The glass ceramic layers are made up of a glass ceramic material including a glass matrix and ceramic particles dispersed in the matrix. The glass ceramic layers are caused to contain hollow or porous silica glass spheres dispersed in the glass ceramic material. The hollow or porous silica glass spheres are covered with a ceramic coating layer containing alumina as a constituent element. Such a structure prevents crystallization of the silica spheres and avoids the resultant rapid increase in the the thermal expansion coefficient of the glass ceramic layers. The structure provided by the process of the invention also precudes the formation of pores in the surfaces of the glass ceramic layers.