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:
Mar. 27, 2001
Filed:
Aug. 02, 1999
Applicant:
Inventors:
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05K 1/03 ; H05K 3/46 ;
U.S. Cl.
CPC ...
H05K 1/03 ; H05K 3/46 ;
Abstract
In the glass-ceramic composition, a weight ratio of a glass and a ceramic is 40 to 60:60 to 40. The glass is composed of 40 to 60 wt % of SiO,, 5 to 9 wt % of Al,O,, 1 to 10 wt % of B,O,, 3 to 5 wt % of Na,O+K,O, 3 to 15 wt % of CaO+MgO+ZnO, and 15 to 40 wt % of PbO, and does not contain Li,O. A softening point of the glass is 650 to 780° C. The circuit substrate includes a laminate substrate formed by laminating insulating substrates, and a conductor circuit formed on a surface of each insulating substrate. The insulating substrate is formed of the glass-ceramic composition. A wiring layer and a via hole conductor are provided inside the laminate substrate.