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:
Jun. 23, 2009
Filed:
Apr. 07, 2004
Applicants:
Hisashi Yamada, Tsukuba, JP;
Takenori Osada, Chiba, JP;
Noboru Fukuhara, Tsukuba, JP;
Inventors:
Assignees:
Sumitomo Chemical Company, Limited, Tokyo, JP;
Sumika Epi Solution Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 29/739 (2006.01); H01L 31/072 (2006.01);
U.S. Cl.
CPC ...
Abstract
A compound semiconductor epitaxial substrate including a substrate, and a sub-collector layer, a collector layer, a base layer, an emitter layer and a contact layer(s) formed in this order on the substrate, the compound semiconductor epitaxial substrate having an oxygen-containing layer between the substrate and the sub-collector layer.