Assignee
KOYAMA MASAKI
JP10 patents
Top patents by PatentIndex Score
US8421184B2Apr 16, 2013
Semiconductor device
KOYAMA MASAKI21 citations92
US8507352B2Aug 13, 2013
Method of manufacturing semiconductor device including insulated gate bipolar transistor and diode
KOYAMA MASAKI8 citations84
US8097901B2Jan 17, 2012
Semiconductor device having insulated gate semiconductor element, and insulated gate bipolar transistor
KOYAMA MASAKI11 citations84
US8952449B2Feb 10, 2015
Semiconductor device having both IGBT area and diode area
KOYAMA MASAKI8 citations83
US8716746B2May 6, 2014
Semiconductor device
KOYAMA MASAKI11 citations83
US9470230B2Oct 18, 2016
Refrigerant compressor and refrigeration cycle apparatus using the same
KOYAMA MASAKI5 citations73
US8481393B2Jul 9, 2013
Semiconductor substrate and method for manufacturing the same, and method for manufacturing semiconductor device
KOYAMA MASAKI4 citations63
US9496138B2Nov 15, 2016
Method for manufacturing oxide semiconductor film, method for manufacturing semiconductor device, and semiconductor device
KOYAMA MASAKI2 citations62
US8216914B2Jul 10, 2012
Method for manufacturing SOI substrate and method for manufacturing semiconductor device
KOYAMA MASAKI2 citations62
US10047746B2Aug 14, 2018
Refrigerant compressor and refrigeration cycle device
KOYAMA MASAKI1 citations51