Inventor
HIRAMATSU KAZUMASA
JP15 patents
⚠️ This page may combine multiple inventors who share the name “HIRAMATSU KAZUMASA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SUMITOMO CHEMICAL CO
6 patentsUS6503610B2Jan 7, 2003
Group III-V compound semiconductor and method of producing the same
SUMITOMO CHEMICAL CO105 citations97
US8053811B2Nov 8, 2011
Group 3-5 nitride semiconductor multilayer substrate, method for manufacturing group 3-5 nitride semiconductor free-standing subtrate, and semiconductor element
SUMITOMO CHEMICAL CO19 citations92
US7399687B2Jul 15, 2008
Substrate of gallium nitride single crystal and process for producing the same
SUMITOMO CHEMICAL CO11 citations82
US6756246B2Jun 29, 2004
Method for fabricating III-V group compound semiconductor
SUMITOMO CHEMICAL CO14 citations82
US6946308B2Sep 20, 2005
Method of manufacturing III-V group compound semiconductor
SUMITOMO CHEMICAL CO7 citations72
US6844574B1Jan 18, 2005
III-V compound semiconductor
SUMITOMO CHEMICAL CO6 citations62
TOYODA GOSEI KK
4 patentsUS5122845AJun 16, 1992
Substrate for growing gallium nitride compound-semiconductor device and light emitting diode
TOYODA GOSEI KK217 citations99
US4911102AMar 27, 1990
Process of vapor growth of gallium nitride and its apparatus
TOYODA GOSEI KK361 citations97
US5218216AJun 8, 1993
Gallium nitride group semiconductor and light emitting diode comprising it and the process of producing the same
TOYODA GOSEI KK78 citations96
US5846844ADec 8, 1998
Method for producing group III nitride compound semiconductor substrates using ZnO release layers
TOYODA GOSEI KK81 citations95
MITSUBISHI CABLE IND LTD
4 patentsUS5770887AJun 23, 1998
GaN single crystal
MITSUBISHI CABLE IND LTD204 citations98
US6225650B1May 1, 2001
GAN group crystal base member having low dislocation density, use thereof and manufacturing methods thereof
MITSUBISHI CABLE IND LTD193 citations97
US5810925ASep 22, 1998
GaN single crystal
MITSUBISHI CABLE IND LTD56 citations95
US6734515B1May 11, 2004
Semiconductor light receiving element
MITSUBISHI CABLE IND LTD17 citations82