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:
Oct. 17, 1995
Filed:
Apr. 13, 1992
Hiroshi Kamezaki, Kawasaki, JP;
Masato Wakamura, Kawasaki, JP;
Kishio Yokouchi, Kawasaki, JP;
Nobuo Kamehara, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A process for manufacturing a multi-layer glass ceramic substrate which includes the steps of forming green sheets containing ceramic powders and glass powders as main ingredients, laminating the green sheets, and firing the laminated green sheets to form a multi-layer glass ceramic substrate, wherein at least one green sheet containing porous glass powders as a part of the glass powders, is provided to control the shrinkage of the green sheets and prevent cracks or delamination. The preferred process includes the steps of forming a single layer by i) forming first green sheets containing ceramic powders, glass powders, hollow glass spheres and porous glass powders as main ingredients, ii) forming an interconnection layer on each of the first green sheets, and iii) laminating the first green sheets with the interconnection layer; sandwiching the signal layer between upper and lower green sheets containing ceramic powders and glass powders as main ingredients; and firing the sandwiched signal layer to form the multi-layer glass ceramic substrate.