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. 04, 2011
Filed:
Jul. 27, 2006
Applicants:
Takeshi Gotoh, Omuta, JP;
Motoharu Fukazawa, Omuta, JP;
Tetsumi Ohtsuka, Omuta, JP;
Inventors:
Assignee:
Denki Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B 9/00 (2006.01); B32B 9/04 (2006.01); B32B 13/04 (2006.01); B32B 19/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Provided are a silicon nitride substrate and a silicon nitride circuit board with excellent electrical characteristics, and power control parts utilizing them. A silicon nitride substrate comprises a silicon nitride sintered body obtainable by sintering a silicon nitride powder in the presence of a sintering aid comprising MgO, YOand SiOin a proportion of (1) MgO/(MgO+SiO)=34-59 mol %, and (2) YO/(YO+SiO)=50-66 mol %, and a silicon nitride circuit board utilizes it.