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:
Nov. 17, 1998
Filed:
Mar. 26, 1997
Applicant:
Inventors:
Assignee:
NGK Spark Plug Co., Ltd., Nagoya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ;
U.S. Cl.
CPC ...
257766 ; 257703 ; 257772 ; 257779 ; 257781 ; 438612 ; 438650 ; 438686 ;
Abstract
A ceramic substrate having on the surface thereof a plurality of pads to be attached to terminal members is provided. Each pad includes a metallic layer formed on the surface of the substrate and a connecting layer made of a nickel base alloy and formed on the metallic layer. A gold-nickel layer made of a gold base alloy containing nickel is formed on the connecting layer. The gold-nickel layer may be formed by first forming a gold layer on the connecting layer and then making nickel in the connecting layer to diffuse into the gold layer by heat treatment. A method of producing such a ceramic substrate is also provided.