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:
Nov. 10, 2015
Filed:
May. 13, 2011
Yuki Seki, Itami, JP;
Issei Satoh, Itami, JP;
Koji Uematsu, Itami, JP;
Yoshiyuki Yamamoto, Itami, JP;
Yuki Seki, Itami, JP;
Issei Satoh, Itami, JP;
Koji Uematsu, Itami, JP;
Yoshiyuki Yamamoto, Itami, JP;
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka-shi, Osaka, JP;
Abstract
A composite base of the present invention includes a sintered base and a base surface flattening layer disposed on the sintered base, and the base surface flattening layer has a surface RMS roughness of not more than 1.0 nm. A composite substrate of the present invention includes the composite base and a semiconductor crystal layer disposed on a side of the composite base where the base surface flattening layer is located, and a difference between a thermal expansion coefficient of the sintered base and a thermal expansion coefficient of the semiconductor crystal layer is not more than 4.5×10K. Thereby, a composite substrate in which a semiconductor crystal layer is attached to a sintered base, and a composite base suitably used for that composite substrate are provided.