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. 12, 2009
Filed:
Apr. 04, 2005
Toshiyuki Nagase, Gotenba, JP;
Yoshiyuki Nagatomo, Gotenba, JP;
Kazuaki Kubo, Mishima, JP;
Takeshi Negishi, Saitama, JP;
Toshiyuki Nagase, Gotenba, JP;
Yoshiyuki Nagatomo, Gotenba, JP;
Kazuaki Kubo, Mishima, JP;
Takeshi Negishi, Saitama, JP;
Mitsubishi Materials Corporation, Tokyo, JP;
Abstract
A base plate for a power module includes: a metal plate, a ceramic base plate joined to the metal plate, and a release agent which includes boron provided in a joint surface between the metal plate and the ceramic base plate. A remaining amount of the release agent is less than 5, as an amount of boron measured by fluorescence X-ray analysis, where the amount of boron is defined as a value obtained by an expression: (a peak height of B-Kα/a peak height of X-Kα) x 100000 and a crystal grain straining region in the joint surface is equal to or less than 40%, or an amount of crystal grain straining in the joint surface is equal to or less than 0.03%.