Inventor
NAKAHARA KEN
JP53 patents
⚠️ This page may combine multiple inventors who share the name “NAKAHARA KEN”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
ROHM CO LTD
35 patentsUS9837521B2Dec 5, 2017
Nitride semiconductor device and fabrication method therefor
ROHM CO LTD29 citations98
US7132691B1Nov 7, 2006
Semiconductor light-emitting device and method for manufacturing the same
ROHM CO LTD189 citations98
US6735230B1May 11, 2004
Semiconductor luminous elements and semiconductor laser
ROHM CO LTD87 citations97
US8004006B2Aug 23, 2011
Nitride semiconductor light emitting element
ROHM CO LTD30 citations93
US6569548B2May 27, 2003
Transparent conductive film of zinc oxide
ROHM CO LTD32 citations93
US7960727B2Jun 14, 2011
Zinc oxide based compound semiconductor device
ROHM CO LTD24 citations86
US10256335B2Apr 9, 2019
Nitride semiconductor device and fabrication method therefor
ROHM CO LTD4 citations84
US7906791B2Mar 15, 2011
Semiconductor light emitting element
ROHM CO LTD11 citations84
US7582905B2Sep 1, 2009
Semiconductor light emitting device
ROHM CO LTD11 citations84
US7196348B2Mar 27, 2007
GaN system semiconductor light emitting device excellent in light emission efficiency and light extracting efficiency
ROHM CO LTD14 citations84
US8053756B2Nov 8, 2011
Nitride semiconductor light emitting element
ROHM CO LTD9 citations83
US7781791B2Aug 24, 2010
Semiconductor light emitting element
ROHM CO LTD19 citations83
US7741637B2Jun 22, 2010
ZnO-based semiconductor device
ROHM CO LTD8 citations81
US7002179B2Feb 21, 2006
ZnO system semiconductor device
ROHM CO LTD10 citations74
US9806824B2Oct 31, 2017
Wireless power supply receiver-transmitter device, wireless power supply receiver and wireless power supply transmitter
ROHM CO LTD2 citations73
US6987029B2Jan 17, 2006
ZnO based compound semiconductor light emitting device and method for manufacturing the same
ROHM CO LTD10 citations73
US11482918B2Oct 25, 2022
Gate drive circuit
ROHM CO LTD5 citations71
US11011970B2May 18, 2021
Gate drive circuit
ROHM CO LTD3 citations71
US11394288B2Jul 19, 2022
Negative voltage generation circuit and power conversion device using same
ROHM CO LTD2 citations67
US8049235B2Nov 1, 2011
Nitride semiconductor light emitting element with bragg reflection layers and anti-reflection layers to improve light extraction efficiency
ROHM CO LTD3 citations63
US7872269B2Jan 18, 2011
Gallium nitride semiconductor light emitting element
ROHM CO LTD6 citations63
US7292382B2Nov 6, 2007
Light control unit
ROHM CO LTD4 citations63
US12369346B2Jul 22, 2025
Nitride semiconductor device and fabrication method therefor
ROHM CO LTD0 citations62
US11990455B2May 21, 2024
Semiconductor device
ROHM CO LTD1 citations62
US11777024B2Oct 3, 2023
Nitride semiconductor device and fabrication method therefor
ROHM CO LTD0 citations62
US10991818B2Apr 27, 2021
Nitride semiconductor device and fabrication method therefor
ROHM CO LTD0 citations62
US8975645B2Mar 10, 2015
Optical filter
ROHM CO LTD2 citations60
US6711198B1Mar 23, 2004
Light source device for laser beam printer
ROHM CO LTD4 citations60
US12446263B2Oct 14, 2025
Nitride semiconductor device
ROHM CO LTD0 citations52
US11393905B2Jul 19, 2022
Nitride semiconductor device
ROHM CO LTD0 citations52
US10686064B2Jun 16, 2020
Nitride semiconductor device and fabrication method therefor
ROHM CO LTD0 citations52
US7948003B2May 24, 2011
Transparent electrode
ROHM CO LTD0 citations52
US7417263B2Aug 26, 2008
Transparent electrode
ROHM CO LTD0 citations52
US11095217B2Aug 17, 2021
Ripple injection circuit and electronic device equipped with this circuit
ROHM CO LTD0 citations49
US11885763B2Jan 30, 2024
Gas concentration measurement system and gas concentration measurement method
ROHM CO LTD0 citations48
NAT INST OF ADVANCED IND SCIEN
6 patentsUS6674098B1Jan 6, 2004
ZnO compound semiconductor light emitting element
NAT INST OF ADVANCED IND SCIEN56 citations95
US6649434B2Nov 18, 2003
Method of manufacturing semiconductor device having ZnO based oxide semiconductor layer
NAT INST OF ADVANCED IND SCIEN27 citations92
US6638846B2Oct 28, 2003
Method of growing p-type ZnO based oxide semiconductor layer and method of manufacturing semiconductor light emitting device
NAT INST OF ADVANCED IND SCIEN34 citations92
US6531408B2Mar 11, 2003
Method for growing ZnO based oxide semiconductor layer and method for manufacturing semiconductor light emitting device using the same
NAT INST OF ADVANCED IND SCIEN14 citations83
US7605012B2Oct 20, 2009
ZnO based compound semiconductor light emitting device and method for manufacturing the same
NAT INST OF ADVANCED IND SCIEN7 citations73
US6472241B2Oct 29, 2002
Radical cell device and method for manufacturing groups II-VI compound semiconductor device
NAT INST OF ADVANCED IND SCIEN7 citations73
NAKAHARA KEN
6 patentsUS8946727B2Feb 3, 2015
Zinc oxide based compound semiconductor device
NAKAHARA KEN4 citations72
US8154036B2Apr 10, 2012
Nitride semiconductor device
NAKAHARA KEN2 citations62
US8610133B2Dec 17, 2013
Photodetection device
NAKAHARA KEN4 citations60
US8247793B2Aug 21, 2012
ZnO-based thin film and ZnO-based semiconductor element
NAKAHARA KEN3 citations60
US8941105B2Jan 27, 2015
Zinc oxide based compound semiconductor light emitting device
NAKAHARA KEN0 citations51
US8410478B2Apr 2, 2013
p-Type MgZnO-based thin film and semiconductor light emitting device
NAKAHARA KEN0 citations48
NIWA DAISUKE
1 patentYAMAGUCHI ATSUSHI
1 patentSAKAI MITSUHIKO
1 patentShowing the top 50 of 53 patents by PatentIndex Score.