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. 29, 1991
Filed:
Feb. 26, 1991
Applicant:
Inventors:
Yasushi Matsudaira, Annaka, JP;
Hiroshi Mogi, Gunma, JP;
Assignee:
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G04B / ;
U.S. Cl.
CPC ...
501 98 ; 501 96 ;
Abstract
Sintered aluminum nitride is prepared by adding a sintering aid to aluminum nitride powder and firing the mixture. The use of a rare earth element oxide mixture comprising 40-80 wt % of Y.sub.2 O.sub.3, 5-15 wt % of Dy.sub.2 O.sub.3, 2-10 wt % of Er.sub.2 O.sub.3, and 2-10 wt % of Yb.sub.2 O.sub.3 as the sintering aid provides sintered aluminum nitride having high thermal conductivity with minimal grain boundary precipitation and thus suitable as heat dissipating substrates.