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:
May. 11, 2004
Filed:
Feb. 06, 2002
Applicant:
Inventors:
Reo Yamamoto, Tokuyama, JP;
Yoshihide Kamiyama, Tokuyama, JP;
Assignee:
Tokuyama Corporation, , JP;
Primary Examiner:
Int. Cl.
CPC ...
B05D 5/12 ;
U.S. Cl.
CPC ...
B05D 5/12 ;
Abstract
A sintered aluminum nitride having satisfactorily densified via holes, which is free from cracking and has an excellent appearance, is produced through firing an aluminum nitride molding having at least one highly isolated through-hole for via hole formation. At least one through-hole for formation of dummy via holes not used for electrical connection is formed around the highly isolated through-hole for via hole formation, and the through-hole for dummy via hole formation is also filled with a conductive paste. Thereafter, the aluminum nitride molding is fired into the sintered aluminum nitride.