1
Michiko Tamano, Toshikazu Onikubo, Toshiyuki Uemura, Tadashi Ogawa, Toshio Enokida: Hole-transporting material and use thereof. Toyo Ink Manufacturing, Wenderoth Lind & Ponack, October 28, 1997: US05681664 (21 worldwide citation)

Hole-transporting materials of the following formula (1) have excellent hole-transporting capability and excellent durability,


2
Michiko Tamano, Satoshi Okutsu, Toshio Enokida: Hole-transporting material and use thereof. Toyo Ink Manufacturing, Wenderoth Lind & Ponack L, October 19, 1999: US05968675 (19 worldwide citation)

A hole-transporting material having excellent hole transportation capability and sufficient durability, used in an organic EL device and an electrophotographic photoreceptor, the hole-transporting material having the general formula specified in claim 1.


3
Tamano Michiko, Okutsu Satoshi, Enokida Toshio: Hole-transporting material and use thereof. Toyo Ink Mfg Co, June 18, 1997: EP0779765-A2 (8 worldwide citation)

A hole-transporting material having excellent hole transportation capability and sufficient durability, used in an organic EL device and an electrophotographic photoreceptor, the hole-transporting material having the following general formula: wherein R to R and Ar to Ar are as defined herein.c