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:
Apr. 11, 2017
Filed:
Dec. 26, 2011
Nobuhiro Okada, Tokyo, JP;
Kazuhito Kamei, Tokyo, JP;
Kazuhiko Kusunoki, Tokyo, JP;
Nobuyoshi Yashiro, Tokyo, JP;
Kouji Moriguchi, Tokyo, JP;
Hironori Daikoku, Susono, JP;
Hiroshi Suzuki, Gotenba, JP;
Tomokazu Ishii, Susono, JP;
Hidemitsu Sakamoto, Susono, JP;
Motohisa Kado, Susono, JP;
Yoichiro Kawai, Okazaki, JP;
Nobuhiro Okada, Tokyo, JP;
Kazuhito Kamei, Tokyo, JP;
Kazuhiko Kusunoki, Tokyo, JP;
Nobuyoshi Yashiro, Tokyo, JP;
Kouji Moriguchi, Tokyo, JP;
Hironori Daikoku, Susono, JP;
Hiroshi Suzuki, Gotenba, JP;
Tomokazu Ishii, Susono, JP;
Hidemitsu Sakamoto, Susono, JP;
Motohisa Kado, Susono, JP;
Yoichiro Kawai, Okazaki, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Aichi-ken, JP;
Abstract
An apparatus for SIC single crystal has an induction heating control unit such that frequency f (Hz) of alternating current to the induction heating unit satisfies Formula (1); D1 (mm) is permeation depth of electromagnetic waves into a crucible side wall by the heating unit, D2 (mm) is permeation depth of electromagnetic waves into a SIC solution, T (mm) is thickness of the crucible side wall of the crucible, and R (mm) is crucible inner radius:(1−)×2/>1.5  (1) where, D1 is defined by Formula (2) and D2 by Formula (3):1=503292×(1/())  (2)2=503292×(1/())  (3); σc is electric conductivity (S/m) of the sidewall, σs is electric conductivity (S/m) of the SiC solution; μc is relative permeability of the sidewall, and μs is relative permeability of the SIC solution.