Inventor
KUMA HITOSHI
JP44 patents
⚠️ This page may combine multiple inventors who share the name “KUMA HITOSHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
IDEMITSU KOSAN CO
29 patentsUS7358661B2Apr 15, 2008
Organic electroluminescent device and display
IDEMITSU KOSAN CO21 citations92
US6844670B2Jan 18, 2005
Color luminous device
IDEMITSU KOSAN CO23 citations92
US10590080B2Mar 17, 2020
Compound, material for organic electroluminescent elements, organic electroluminescent element, and electronic device
IDEMITSU KOSAN CO6 citations84
US9812661B2Nov 7, 2017
Organic electroluminescent device
IDEMITSU KOSAN CO12 citations84
US8723171B2May 13, 2014
Organic electroluminescence device
IDEMITSU KOSAN CO11 citations84
US7923917B2Apr 12, 2011
Color conversion layer and light-emitting device
IDEMITSU KOSAN CO9 citations84
US7777413B2Aug 17, 2010
Organic electroluminescent device having an optical resonator
IDEMITSU KOSAN CO10 citations84
US7768195B2Aug 3, 2010
Organic electroluminescent device with improved luminous efficiency
IDEMITSU KOSAN CO8 citations84
US7737625B2Jun 15, 2010
Organic electroluminescent device with carrier blocking layer interposed between two emitting layers
IDEMITSU KOSAN CO9 citations84
US7550914B2Jun 23, 2009
Organic electroluminescence display device
IDEMITSU KOSAN CO9 citations84
US7501189B2Mar 10, 2009
White organic electroluminescent device
IDEMITSU KOSAN CO13 citations84
US7233104B2Jun 19, 2007
Color emission device
IDEMITSU KOSAN CO12 citations84
US8035297B2Oct 11, 2011
Organic electroluminescent device with carrier blocking layer interposed between two emitting layers
IDEMITSU KOSAN CO5 citations74
US12077500B2Sep 3, 2024
Compound, material for organic electroluminescent elements, organic electroluminescent element, and electronic device
IDEMITSU KOSAN CO1 citations73
US11739061B2Aug 29, 2023
Compound, material for organic electroluminescent elements, organic electroluminescent element, and electronic device
IDEMITSU KOSAN CO2 citations73
US10297761B2May 21, 2019
Organic electroluminescent element
IDEMITSU KOSAN CO3 citations73
US10186665B2Jan 22, 2019
Organic electroluminescent element
IDEMITSU KOSAN CO5 citations73
US9882144B2Jan 30, 2018
Organic electroluminescent element
IDEMITSU KOSAN CO6 citations73
US12492162B2Dec 9, 2025
Organic electroluminescent element and electronic device
IDEMITSU KOSAN CO0 citations63
US12022728B2Jun 25, 2024
Organic electroluminescent element and electronic device
IDEMITSU KOSAN CO0 citations63
US11552251B2Jan 10, 2023
Organic electroluminescent element and electronic device
IDEMITSU KOSAN CO0 citations63
US7956529B2Jun 7, 2011
Organic electroluminescent color light-emitting apparatus with organic electroluminescent devices with adjusted optical distances between electrodes
IDEMITSU KOSAN CO4 citations63
US7221090B2May 22, 2007
Blue organic electroluminescent device and display using same
IDEMITSU KOSAN CO3 citations63
US11856808B2Dec 26, 2023
Organic electroluminescent element and electronic device drivable at low voltage with improved lifetime
IDEMITSU KOSAN CO1 citations62
US11059781B2Jul 13, 2021
Compound, material for organic electroluminescent elements, organic electroluminescent element, and electronic device
IDEMITSU KOSAN CO0 citations62
US10851055B2Dec 1, 2020
Compound, material for organic electroluminescent elements, organic electroluminescent element, and electronic device
IDEMITSU KOSAN CO0 citations52
USRE47654EOct 22, 2019
Organic electroluminescence device
IDEMITSU KOSAN CO0 citations52
US7843134B2Nov 30, 2010
Organic EL emission devices connected in series
IDEMITSU KOSAN CO0 citations42
US10862049B2Dec 8, 2020
Composition, organic-electroluminescence-device material, composition film, organic electroluminescence device, and electronic device
IDEMITSU KOSAN CO0 citations39