Patents by Inventor Kaoru Teramura

Kaoru Teramura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Tricyclic pyrazine compound and electrophotographic photoconductor comprising the same
    Patent number: 5618935
    Abstract: A pyrazine compound of formula (I) and a pyrazine compound of formula (II): ##STR1## wherein R is an unsubstituted or substituted phenyl group, an unsubstituted or substituted naphthyl group; and an electrophotographic photoconductor which includes an electroconductive support and a photoconductive layer formed thereon containing a charge generating material and a charge transporting material which is any of the above-mentioned pyrazine compounds of formula (I) and formula (II).
    Type: Grant
    Filed: March 24, 1995
    Date of Patent: April 8, 1997
    Assignee: Ricoh Company, Ltd.
    Inventors: Masayuki Shoshi, Yumi Ichikawa, Kaoru Teramura, Masayuki Koyano, Megumi Kawahara
  • Positively-chargeable single-layered type electrophotographic photoconductor
    Patent number: 5492784
    Abstract: 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 which are dispersed in a matrix binder agent, with the relationship of the oxidation potential (E.sub.ox) of the charge generating material.ltoreq.the oxidation potential (E.sub.ox) of the organic positive hole transporting material being satisfied.
    Type: Grant
    Filed: August 6, 1993
    Date of Patent: February 20, 1996
    Assignee: Ricoh Company, Ltd.
    Inventors: Masao Yoshikawa, Masayuki Shoshi, Tetsuro Suzuki, Masakatsu Shimoda, Kaoru Teramura, Megumi Kawahara, Akio Kojima, Masaomi Sasaki, Masafumi Ohta
  • Pyrazine compound and electrophotographic photoconductor comprising the same
    Patent number: 5460909
    Abstract: A pyrazine compound of formula (I) and a pyrazine compound of formula (II): ##STR1## wherein R is an unsubstituted or substituted phenyl group, an unsubstituted or substituted naphthyl group; and an electrophotographic photoconductor which includes an electroconductive support and a photoconductive layer formed thereon containing a charge generating material and a charge transporting material which is any of the above-mentioned pyrazine compounds of formula (I) and formula (II).
    Type: Grant
    Filed: June 15, 1994
    Date of Patent: October 24, 1995
    Assignee: Ricoh Company, Ltd.
    Inventors: Masayuki Shoshi, Yumi Ichikawa, Kaoru Teramura, Masayuki Koyano, Megumi Kawahara
  • High dielectric polymeric optical recording medium
    Patent number: 5326678
    Abstract: A high dielectric polymeric optical recording medium for recording information by heating the portions of the recording medium corresponding to the information to be recorded by being exposed to a beam of light, followed by the application of a reverse electric field to the recording medium, thereby selectively reversing the polarity of the heated portions in the recording medium, is disclosed, which comprises a high dielectric polymeric recording layer containing a high dielectric polymeric composition comprising a high dielectric polymeric material and a nonionic dye serving as a light-absorption agent which is compatible with or dispersible in the high dielectric polymeric material.
    Type: Grant
    Filed: April 23, 1992
    Date of Patent: July 5, 1994
    Assignee: Ricoh Company Ltd.
    Inventors: Akio Kojima, Takeo Yamaguchi, Masao Yoshikawa, Isamu Shibata, Kaoru Teramura