Inventor · disambiguated record
Norimasa Yokoyama
Also filed as: YOKOYAMA NORIMASA
54 granted patents·19 pending applications·93 citations·filing 1989–2021
97Inventor score
Files withHODOGAYA CHEMICAL CO LTD37YOKOYAMA NORIMASA29MIKI TETSUZO2ADACHI CHIHAYA1NAT UNIVERSITY CORP SHINSHU UNIVERSITY1
Top patents by PatentIndex Score
73 records- 0191US11056653B2Organic electroluminescence deviceHODOGAYA CHEMICAL CO LTD·Filed 2017·Granted Jul 6, 2021·5 cites·15 claims
- 0291US10818844B2Organic electroluminescent deviceHODOGAYA CHEMICAL CO LTD·Filed 2015·Granted Oct 27, 2020·7 cites·13 claims
- 0390US9123897B2Benzotriazole derivatives and organic electroluminescent devices using the derivativesHODOGAYA CHEMICAL CO LTD·Filed 2012·Granted Sep 1, 2015·15 cites·12 claims
- 0483US8735626B2Method of producing aromatic amino compoundsYOKOYAMA NORIMASA·Filed 2010·Granted May 27, 2014·3 cites·7 claims
- 0582US10505119B2Organic electroluminescence deviceHODOGAYA CHEMICAL CO LTD·Filed 2016·Granted Dec 10, 2019·3 cites·11 claims
- 0682US8053092B2m-carbazolylphenyl compoundsHODOGAYA CHEMICAL CO LTD·Filed 2006·Granted Nov 8, 2011·9 cites·13 claims
- 0780US9525140B2Arylamine compound useful in an organic electroluminescent deviceHODOGAYA CHEMICAL CO LTD·Filed 2013·Granted Dec 20, 2016·3 cites·8 claims
- 0878US9705099B2Phosphorescent organic light emitting devices having a hole transporting cohost material in the emissive regionUNIVERSAL DISPLAY CORP·Filed 2013·Granted Jul 11, 2017·4 cites·29 claims
- 0978US8252431B2Compound wherein substituted bipyridyl group is connected with pyridoindole ring structure through phenylene group, and organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2008·Granted Aug 28, 2012·2 cites·20 claims
- 1077US8168308B2Compound having pyridoindole ring structure having substituted pyridyl group attached thereto, and organic electroluminescence elementYOKOYAMA NORIMASA·Filed 2007·Granted May 1, 2012·4 cites·12 claims
- 1176US8771841B2Organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2009·Granted Jul 8, 2014·1 cites·24 claims
- 1275US9732036B2Compound having carbazole ring structure, and organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2010·Granted Aug 15, 2017·2 cites·11 claims
- 1375US7867632B2Arylamine compound and organic electroluminescence deviceHODOGAYA CHEMICAL CO LTD·Filed 2006·Granted Jan 11, 2011·2 cites·10 claims
- 1474US9818949B2Compound having acridan ring structure, and organic electroluminescent deviceHODOGAYA CHEMICAL CO LTD·Filed 2014·Granted Nov 14, 2017·2 cites·16 claims
- 1574US9196837B2Compound having indenocarbazole ring structure, and organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2011·Granted Nov 24, 2015·3 cites·18 claims
- 1674US8748014B2Compound having a substituted anthracene ring structure and pyridoindole ring structure, and organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2010·Granted Jun 10, 2014·3 cites·14 claims
- 1773US9985216B2Indenoindole derivative and organic electroluminescent elementHODOGAYA CHEMICAL CO LTD·Filed 2014·Granted May 29, 2018·1 cites·6 claims
- 1873US9685612B2Compound having substituted triphenylene ring structure, and organic electroluminescent deviceADACHI CHIHAYA·Filed 2012·Granted Jun 20, 2017·2 cites·1 claims
- 1973US8624228B2Compound having pyridoindole ring structure bonded with substituted pyridyl group, and organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2009·Granted Jan 7, 2014·1 cites·14 claims
- 2073US7964626B2Process for producing N,N′-carbonyldiimidazoleHODOGAYA CHEMICAL CO LTD·Filed 2005·Granted Jun 21, 2011·1 cites·10 claims
- 2172US10497876B2Organic electroluminescent deviceHODOGAYA CHEMICAL CO LTD·Filed 2015·Granted Dec 3, 2019·1 cites·20 claims
- 2269US9306175B2Organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2010·Granted Apr 5, 2016·2 cites·13 claims
- 2369US9196839B2Compound having triphenylamine structure, and organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2011·Granted Nov 24, 2015·1 cites·4 claims
- 2469US8586210B2Compound having substituted anthracene ring structure and pyridoindole ring structure and organic electroluminescence deviceYOKOYAMA NORIMASA·Filed 2009·Granted Nov 19, 2013·3 cites·8 claims
- 2569US8247087B2Compound having oxadiazole ring structure bonded with aromatic heterocyclic ring and organic electroluminescent deviceMIKI TETSUZO·Filed 2006·Granted Aug 21, 2012·4 cites·20 claims
- 2667US10059725B2Compound having triphenylsilyl group and triarylamine structure, and organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2009·Granted Aug 28, 2018·1 cites·9 claims
- 2767US8852759B2Compound having acridan ring structure, and organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2011·Granted Oct 7, 2014·1 cites·6 claims
- 2866US8227096B2Arylamine compound and organic electroluminescence deviceMIKI TETSUZO·Filed 2010·Granted Jul 24, 2012·1 cites·12 claims
- 2963US9238624B2Method of producing aromatic amino compoundsHODOGAYA CHEMICAL CO LTD·Filed 2013·Granted Jan 19, 2016·0 cites·6 claims
- 3062US12089488B2Organic electroluminescent deviceHODOGAYA CHEMICAL CO LTD·Filed 2018·Granted Sep 10, 2024·0 cites·17 claims
- 3162US10096779B2Pyrimidine derivatives and organic electroluminescent devicesHODOGAYA CHEMICAL CO LTD·Filed 2014·Granted Oct 9, 2018·0 cites·7 claims
- 3262US9705092B2Phosphorescent organic light emitting devices combined with hole transport material having high operating stabilityYAMAMOTO HITOSHI·Filed 2011·Granted Jul 11, 2017·1 cites·19 claims
- 3362US9564600B2Compound having an indolocarbazole ring structure and organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2012·Granted Feb 7, 2017·1 cites·3 claims
- 3462US9005776B2Compound having benzotriazole ring structure and organic electroluminescent elementYOKOYAMA NORIMASA·Filed 2010·Granted Apr 14, 2015·1 cites·15 claims
- 3561US10797242B2Compound having substituted triphenylene ring structure, and organic electroluminescent deviceHODOGAYA CHEMICAL CO LTD·Filed 2017·Granted Oct 6, 2020·0 cites·6 claims
- 3658US10026903B2Compound having substituted triphenylene ring structure, and organic electroluminescent deviceHODOGAYA CHEMICAL CO LTD·Filed 2017·Granted Jul 17, 2018·0 cites·4 claims
- 3756US2014048787A1Compound having triazole ring structure substituted with pyridyl group and organic electroluminescent deviceNAT UNIVERSITY CORP SHINSHU UNIVERSITY·Filed 2013·Application pending·0 cites
- 3856US2013285025A1Compound having triazole ring structure substituted with pyridyl group and organic electroluminescent deviceHODOGAYA CHEMICAL CO LTD·Filed 2013·Application pending·0 cites
- 3955US9755152B2Compound having substituted anthracene ring structure and pyridoindole ring structure, and organic electroluminescent deviceHODOGAYA CHEMICAL CO LTD·Filed 2014·Granted Sep 5, 2017·0 cites·12 claims
- 4055US2014225100A1Organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2012·Application pending·0 cites
- 4154US8722209B2Compound having pyridoindole ring structure having substituted pyridyl group attached thereto, and organic electroluminescence elementYOKOYAMA NORIMASA·Filed 2012·Granted May 13, 2014·0 cites·12 claims
- 4254US2013341604A1Compound having substituted anthracene ring structure and pyridoindole ring structure and organic electroluminescence deviceHODOGAYA CHEMICAL CO LTD·Filed 2013·Application pending·0 cites
- 4354US2023112128A1Arylamine compound and organic electroluminescent elementHODOGAYA CHEMICAL CO LTD·Filed 2021·Application pending·0 cites
- 4452US8642189B2Substituted bipyridyl compound and organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2009·Granted Feb 4, 2014·0 cites·11 claims
- 4552US2009102361A1Compound having triazole ring structure substituted with pyridyl group and organic electroluminescent deviceHODOGAYA CHEMICAL CO LTD·Filed 2006·Application pending·0 cites
- 4651US9444055B2Organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2012·Granted Sep 13, 2016·0 cites·6 claims
- 4751US2023138055A1Organic electroluminescent deviceHODOGAYA CHEMICAL CO LTD·Filed 2021·Application pending·0 cites
- 4850US8927119B2Compound having substituted anthracene ring structure and pyridoindole ring structure, and organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2010·Granted Jan 6, 2015·0 cites·14 claims
- 4950US8716698B2Organic electroluminescent device containing arylamine compound and bipyridyl compoundYOKOYAMA NORIMASA·Filed 2009·Granted May 6, 2014·0 cites·3 claims
- 5049US10541369B2Compound having substituted bipyridyl group and pyridoinodole ring structure, and organic electroluminescent deviceYOKOYAMA NORIMASA·Filed 2012·Granted Jan 21, 2020·0 cites·8 claims
Showing the top 50 of 73 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when Norimasa Yokoyama files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →