Inventor
YAMAKAWA MASAHIKO
JP38 patents
⚠️ This page may combine multiple inventors who share the name “YAMAKAWA MASAHIKO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
TOSHIBA KK
18 patentsUS10231305B2Mar 12, 2019
White light source system
TOSHIBA KK15 citations94
US9605815B2Mar 28, 2017
White light source and white light source system including the same
TOSHIBA KK20 citations93
US11094679B2Aug 17, 2021
White light source system
TOSHIBA KK4 citations84
US10674577B2Jun 2, 2020
White light source system
TOSHIBA KK6 citations84
US10375786B2Aug 6, 2019
White light source system
TOSHIBA KK6 citations84
US8796915B2Aug 5, 2014
LED light bulb
TOSHIBA KK8 citations84
US7696685B2Apr 13, 2010
Phosphor and method for producing same, and light-emitting device using same and method for manufacturing such device
TOSHIBA KK8 citations84
US7649310B2Jan 19, 2010
White LED, backlight using same and liquid crystal display
TOSHIBA KK11 citations84
US10473274B2Nov 12, 2019
White light source system
TOSHIBA KK7 citations82
US4733126AMar 22, 1988
Phosphor and fluorescent lamp using the same
TOSHIBA KK19 citations82
US10420183B2Sep 17, 2019
White light source and white light source system
TOSHIBA KK6 citations73
US9551467B2Jan 24, 2017
White light source and white light source system including the same
TOSHIBA KK5 citations73
US9082939B2Jul 14, 2015
White light source and white light source system including the same
TOSHIBA KK6 citations73
US11084979B2Aug 10, 2021
Europium-activated alkaline-earth chloroapatite phosphor and light-emitting device thereof
TOSHIBA KK0 citations61
US10378709B2Aug 13, 2019
Illumination system for reproducing the color temperature range of solar light for illuminating exhibits
TOSHIBA KK0 citations52
US5905333AMay 18, 1999
Low pressure mercury vapor electric discharge lamp and method of manufacturing the lamp
TOSHIBA KK3 citations51
US9115855B2Aug 25, 2015
White light source
TOSHIBA KK0 citations50
US9228718B2Jan 5, 2016
LED light bulb
TOSHIBA KK0 citations42
SEOUL SEMICONDUCTOR CO LTD
6 patentsUS11721675B2Aug 8, 2023
White light source system
SEOUL SEMICONDUCTOR CO LTD4 citations85
US11978726B2May 7, 2024
White light source system
SEOUL SEMICONDUCTOR CO LTD2 citations73
US12072069B2Aug 27, 2024
Method for using white light source, and white light source
SEOUL SEMICONDUCTOR CO LTD2 citations72
US12546443B2Feb 10, 2026
Method for using white light source, and white light source
SEOUL SEMICONDUCTOR CO LTD0 citations62
US12482794B2Nov 25, 2025
White light source system
SEOUL SEMICONDUCTOR CO LTD0 citations62
US11430771B2Aug 30, 2022
White light source system
SEOUL SEMICONDUCTOR CO LTD0 citations62
YAMAKAWA MASAHIKO
4 patentsUS9109762B2Aug 18, 2015
White light source and white light source system including the same
YAMAKAWA MASAHIKO7 citations83
US8710532B2Apr 29, 2014
White light emitting lamp and white LED lighting apparatus including the same
YAMAKAWA MASAHIKO7 citations82
US8884512B2Nov 11, 2014
White light emitting lamp and white LED lighting apparatus including the same
YAMAKAWA MASAHIKO6 citations72
US9112120B2Aug 18, 2015
White light source and white light source system including the same
YAMAKAWA MASAHIKO3 citations62
TOSHIBA MATERIALS CO LTD
4 patentsUS10368408B2Jul 30, 2019
Light emitting device and LED light bulb
TOSHIBA MATERIALS CO LTD2 citations72
US11007375B2May 18, 2021
Light source for myopia prevention article and method of using light source for myopia prevention article
TOSHIBA MATERIALS CO LTD2 citations71
US12023513B2Jul 2, 2024
Light source for myopia prevention article and method of using light source for myopia prevention article
TOSHIBA MATERIALS CO LTD0 citations61
US10368409B2Jul 30, 2019
Light emitting device and LED light bulb
TOSHIBA MATERIALS CO LTD0 citations51