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:
Aug. 20, 1991
Filed:
Sep. 27, 1990
Kiyoshi Iyogi, Kawasaki, JP;
Takaaki Yasumoto, Kawasaki, JP;
Toshirou Yanazawa, Yokohama, JP;
Nobuo Iwase, Kamakura, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A circuit board includes an aluminum nitride substrate, and a circuit pattern formed on the substrate and having a multilayered structure in which a metal oxynitride layer represented by formula Al.sub.u Ml.sub.v M2.sub.x O.sub.y N.sub.z (wherein M1 represents a metal selected from the group consisting of Ti, Cr, Ta, and Zr, M2 represents a metal selected from the group consisting of Ni, Pt, Pd, W, Nb, and Mo, u represents 3 to 50 atm %, v represents 3 to 78 atm %, x represents 0 to 50 atm %, y represents 0.005 to 25 atm %, and z represents 5 to 70 atm %), a bonding layer consisting essentially of a metal represented by M1, a barrier layer consisting essentially of a metal represented by M2, and a conductor layer consisting essentially of Au are stacked in the order named.