1
Takaaki Ikegami, Eiji Kurimoto, Takashi Rokutanzono, Katsuichi Ohta, Masaomi Sasaki, Yasuo Suzuki, Kaoru Tadokoro, Megumi Kawahara, Masayuki Koyano: Electrophotographic photoconductor containing disazo and trisazo pigments. Ricoh Company, Oblon Spivak Mcclelland Maier & Neustadt P C, November 26, 1996: US05578405 (61 worldwide citation)

An electrophotographic photoconductor includes an electroconductive support and a single-layered photoconductive layer formed thereon, containing a charge transporting material, a binder resin, and a simultaneously pulverized mixture including at least one disazo pigment of formula (1) and at least ...


2
Masaru Shimada, Masaomi Sasaki: Aqueous ink composition. Ricoh Company, Flynn Thiel Boutell & Tanis, February 19, 1985: US04500355 (56 worldwide citation)

An aqueous ink composition for general use and for ink-jet printing which comprises, as its main components at least one dye selected from the group consisting of a cyan azo dye, a megenta azo dye and a yellow azo dye and a humectant.


3
Takeo Kazami, Kiyoshi Sakai, Mitsuru Hashimoto, Masaomi Sasaki, Kyoji Tsutsui, Masafumi Ohta: Electrophotographic element having charge transport layer. Ricoh, Blanchard Flynn Thiel Boutell & Tanis, January 13, 1981: US04245021 (53 worldwide citation)

An electrophotographic element according to the present invention exhibits an exceedingly high sensitivity and it comprises (1) an electroconductive support, a charge producing layer consisting essentially of a charge producing substance and a charge transport layer consisting essentially of a charg ...


4
Masao Yoshikawa, Masayuki Shoshi, Tetsuro Suzuki, Masakatsu Shimoda, Kaoru Teramura, Megumi Kawahara, Akio Kojima, Masaomi Sasaki, Masafumi Ohta: Positively-chargeable single-layered type electrophotographic photoconductor. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt, February 20, 1996: US05492784 (53 worldwide citation)

A positively-chargeable single-layered type organic electrophotographic photoconductor composed of an electroconductive support and an organic single-layered photoconductive layer containing a charge generating material, an organic positive hole transporting material and an organic acceptor compound ...


5
Kazukiyo Nagai, Tetsuro Suzuki, Masaomi Sasaki, Kohkoku Ri, Shinichi Kawamura: Electrophotographic photoconductor, and process cartridge and image forming apparatus using the same. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, April 3, 2001: US06210848 (45 worldwide citation)

An electrophotographic photoconductor has an electroconductive support and a photoconductive layer formed thereon, a surface top portion of the photoconductor containing a high-molecular charge transport material including a polycarbonate copolymer synthesized from (a) a bisphenol monomer with an io ...


6
Akira Katayama, Masaomi Sasaki, Katsukiyo Nagai, Chiaki Tanaka, Shinichi Kawamura, Tetsuro Suzuki, Susumu Suzuka, Katsuhiro Morooka: Electrophotographic photoconductor and aromatic polycarbonate resin for use therein. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, May 23, 2000: US06066428 (45 worldwide citation)

An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer which is formed on the support and contains as an effective component an aromatic polycarbonate resin having a structural unit of formula (I), or the structural unit of formula (I) and a structural un ...


7
Masaru Shimada, Masaomi Sasaki: Aqueous ink composition. Ricoh Company, Oblon Fisher Spivak McClelland & Maier, November 4, 1986: US04620875 (45 worldwide citation)

An aqueous ink composition is disclosed, which comprises at least: (1) 0.5 to 30 parts by weight of a dye having the formula of ##STR1## wherein R.sup.1 and R.sup.2 each represent hydrogen, an alkyl group, a phenyl group, an acyl group an acetyl group or a phenylsulfonyl group, R.sup.3 and R.sup.4 e ...


8
Akira Katayama, Masaomi Sasaki, Katsukiyo Nagai, Chiaki Tanaka, Shinichi Kawamura, Tetsuro Suzuki, Susumu Suzuka, Katsuhiro Morooka: Electrophotographic photoconductor and aromatic polycarbonate resin for use therein. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, February 27, 2001: US06194535 (38 worldwide citation)

An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer which is formed on the support and contains as an effective component an aromatic polycarbonate resin having a structural unit of formula (I), or the structural unit of formula (I) and a structural un ...


9
Tamotsu Aruga, Masaomi Sasaki, Tomoyuki Shimada: Electrophotographic photoconductor and triphenylamine compounds for use in the same. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt, September 18, 1990: US04957838 (37 worldwide citation)

An electrophotographic photoconductor is disclosed, which comprises an electroconductive support and a photoconductive layer formed thereon comprising as an effective component at least one triphenylamine compound represented by the following formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, ...


10
Kohkoku Ri, Masaomi Sasaki, Kazukiyo Nagai, Shinichi Kawamura, Susumu Suzuka, Katsuhiro Morooka: Electrophotographic photoconductor and method of producing aromatic polycarbonate resin for use in the photoconductor. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, February 13, 2001: US06187492 (37 worldwide citation)

A method of producing an aromatic polycarbonate resin includes the step of carrying out solution polymerization of a diphenol compound having a triarylamine structure with a diol compound of formula (I):