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:
Sep. 01, 2015
Filed:
Sep. 05, 2012
Masahiro Hayashi, Miyagi, JP;
Seiji Sarayama, Miyagi, JP;
Takashi Satoh, Miyagi, JP;
Hiroshi Nambu, Kanagawa, JP;
Chiharu Kimura, Miyagi, JP;
Naoya Miyoshi, Miyagi, JP;
Masahiro Hayashi, Miyagi, JP;
Seiji Sarayama, Miyagi, JP;
Takashi Satoh, Miyagi, JP;
Hiroshi Nambu, Kanagawa, JP;
Chiharu Kimura, Miyagi, JP;
Naoya Miyoshi, Miyagi, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
A group 13 nitride crystal has a hexagonal crystal structure and at least contains nitrogen atom and at least a kind of metal atoms selected from a group consisting of B, Al, Ga, In, and Tl. The group 13 nitride crystal includes a first region located at an inner side of a cross section intersecting a c-axis, and a second region surrounding at least a part of an outer periphery of the first region, having a thickness larger than a maximum diameter of the first region, and having a carrier density higher than that of the first region.