Inventor
TOYOSHIMA HIROAKI
JP12 patents
⚠️ This page may combine multiple inventors who share the name “TOYOSHIMA HIROAKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
IDEMITSU KOSAN CO
6 patentsUS11575087B1Feb 7, 2023
Organic electroluminescence device, light emitting device, organic electroluminescence display device and electronic device
IDEMITSU KOSAN CO7 citations74
US11856808B2Dec 26, 2023
Organic electroluminescent element and electronic device drivable at low voltage with improved lifetime
IDEMITSU KOSAN CO1 citations62
US11552259B1Jan 10, 2023
Organic electroluminescent element and electronic device
IDEMITSU KOSAN CO1 citations62
US11489128B1Nov 1, 2022
Organic electroluminescent element emitting light at high luminous effiency and electronic device
IDEMITSU KOSAN CO1 citations62
US10833281B2Nov 10, 2020
Organic electroluminescence composition, material for organic electroluminescence element, solution of material for organic electroluminescence element, and organic electroluminescence element
IDEMITSU KOSAN CO1 citations62
US12538638B2Jan 27, 2026
Organic electroluminescent element and electronic device
IDEMITSU KOSAN CO0 citations51
DENKA COMPANY LTD
5 patentsUS11279876B2Mar 22, 2022
Phosphor and light-emitting device using same
DENKA COMPANY LTD2 citations68
US11952520B2Apr 9, 2024
Method for manufacturing phosphor powder, phosphor powder, and light emitting device
DENKA COMPANY LTD0 citations53
US10093854B2Oct 9, 2018
Phosphor and light emitting device
DENKA COMPANY LTD1 citations50
US12256579B2Mar 18, 2025
Phosphor, method of producing phosphor, light-emitting element, light-emitting device, and image display apparatus
DENKA COMPANY LTD0 citations47
US12006459B2Jun 11, 2024
Phosphor powder and light emitting device
DENKA COMPANY LTD0 citations42