Inventor

YOKOYAMA NORIMASA

JP54 patents

⚠️ This page may combine multiple inventors who share the name “YOKOYAMA NORIMASA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

YOKOYAMA NORIMASA

HODOGAYA CHEMICAL CO LTD

Organic electroluminescent device

m-carbazolylphenyl compounds

Benzotriazole derivatives and organic electroluminescent devices using the derivatives

Organic electroluminescence device

Compound having acridan ring structure, and organic electroluminescent device

Arylamine compound useful in an organic electroluminescent device

Organic electroluminescence device

Organic electroluminescent device

Arylamine compound and organic electroluminescence device

Benzamide derivatives and plant growth regulants containing them

Organic electroluminescent device

Organic electroluminescence element

Pyrimidine derivatives and organic electroluminescent devices

Method of producing aromatic amino compounds

Compound having substituted triphenylene ring structure, and organic electroluminescent device

Organic electroluminescent device

Compound having substituted triphenylene ring structure, and organic electroluminescent device

Compound having substituted anthracene ring structure and pyridoindole ring structure, and organic electroluminescent device

Process for producing N,N′-carbonyldiimidazole

Indenoindole derivative and organic electroluminescent element

Compound having substituted pyridyl group and pyridoindole ring structure linked through phenylene group, and organic electroluminescent device

Benzamide derivatives and plant growth regulants containing them

Pyrimidine derivative and organic electroluminescent devices

YOKOYAMA NORIMASA

Compound having carbazole ring structure, and organic electroluminescent device

Organic electroluminescent device

Compound having indenocarbazole ring structure, and organic electroluminescent device

Method of producing aromatic amino compounds

Compound wherein substituted bipyridyl group is connected with pyridoindole ring structure through phenylene group, and organic electroluminescent device

Compound having pyridoindole ring structure having substituted pyridyl group attached thereto, and organic electroluminescence element

Compound having a substituted anthracene ring structure and pyridoindole ring structure, and organic electroluminescent device

Compound having substituted anthracene ring structure and pyridoindole ring structure and organic electroluminescence device

Organic electroluminescent device

Compound having acridan ring structure, and organic electroluminescent device

Compound having substituted bipyridyl group and pyridoinodole ring structure, and organic electroluminescent device

Compound having benzotriazole ring structure and organic electroluminescent element

Compound having substituted anthracene ring structure and pyridoindole ring structure, and organic electroluminescent device

Organic electroluminescent device

Compound having pyridoindole ring structure having substituted pyridyl group attached thereto, and organic electroluminescence element

Substituted bipyridyl compound and organic electroluminescent device

Compound having triphenylsilyl group and triarylamine structure, and organic electroluminescent device

Compound having pyridoindole ring structure bonded with substituted pyridyl group, and organic electroluminescent device

Compound having an indolocarbazole ring structure and organic electroluminescent device

Compound having triphenylamine structure, and organic electroluminescent device

Compound having acridan ring structure, and organic electroluminescent device

Organic electroluminescent device

MIKI TETSUZO

Compound having oxadiazole ring structure bonded with aromatic heterocyclic ring and organic electroluminescent device

Arylamine compound and organic electroluminescence device

UNIVERSAL DISPLAY CORP

Phosphorescent organic light emitting devices having a hole transporting cohost material in the emissive region

ADACHI CHIHAYA

Compound having substituted triphenylene ring structure, and organic electroluminescent device

YAMAMOTO HITOSHI

Phosphorescent organic light emitting devices combined with hole transport material having high operating stability