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:
Jan. 11, 2011
Filed:
Mar. 04, 2009
Applicants:
Takeshi Meguro, Kitaibaraki, JP;
Takayuki Suzuki, Hitachi, JP;
Ken Ikeda, Tsuchiura, JP;
Inventors:
Assignee:
Hitachi Cable, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 21/20 (2006.01); H01L 21/36 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for manufacturing a nitride semiconductor substrate including the steps of: forming a nitride semiconductor layer on a sapphire substrate, and manufacturing a freestanding nitride semiconductor substrate by using the nitride semiconductor layer separated from the sapphire substrate, wherein variability of inclinations of the C-axes, being a difference between a maximum value and a minimum value of inclination of the C-axes in a radially-outward direction at each point on a front surface of the sapphire substrate is 0.3° or more and 1° or less.