Patents by Inventor Toshiki Nanya

Toshiki Nanya 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).

  • Electrophotographic positive charging toner containing a copper phthalocyanine blue pigment
    Patent number: 4931374
    Abstract: A toner for developing latent electrostatic images is disclosed which comprises a binder agent and .epsilon.-type copper phthalocyanine blue pigment which serves as coloring agent and positive polarity controlling agent.
    Type: Grant
    Filed: May 31, 1985
    Date of Patent: June 5, 1990
    Assignee: Ricoh Company, Ltd.
    Inventors: Masami Tomita, Toshiyasu Kawabata, Toshiki Nanya, Hisao Murayama
  • Toner for developing electrostatic latent image
    Patent number: 4762763
    Abstract: This invention relates to a toner for developing an electrostatic latent image, which contains a coloring agent, a binder resin and a charge controlling agent as the main components, said charge controlling agent being a metal salt of salicylic acid or derivatives.
    Type: Grant
    Filed: December 8, 1986
    Date of Patent: August 9, 1988
    Assignee: Ricoh Co., Ltd.
    Inventors: Yoshihiro Nomura, Noriaki Ide, Kazumi Ohtaki, Masami Tomita, Hachiro Tosaka, Toshiki Nanya, Motoi Orihara, Shunichi Chiba, Satoru Inoue, Yasuo Asahina, Hiroyuki Fushimi
  • Toner for developing latent electrostatic images
    Patent number: 4758489
    Abstract: A red toner for developing latent electrostatic images is disclosed which comprises a binder agent, C.I. Pigment Red 48 and C.I. Pigment Red 81.
    Type: Grant
    Filed: August 18, 1986
    Date of Patent: July 19, 1988
    Assignee: Ricoh Company, Ltd.
    Inventors: Masami Tomita, Satoru Inoue, Akio Matsui, Toshiki Nanya, Fumihiro Sasaki
  • Electrophotographic toner containing triazolium compound as charge controlling agent
    Patent number: 4554233
    Abstract: A toner for developing latent electrostatic images comprising a binder agent and a charge controlling agent of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 independently represent an unsubstituted or substituted aromatic ring, such as an unsubstituted or substituted benzene ring or naphthalene ring; and n is an integer of 0 or 1.
    Type: Grant
    Filed: October 5, 1983
    Date of Patent: November 19, 1985
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsuru Hashimoto, Toshiyasu Kawabata, Toshiki Nanya, Hisao Murayama
  • Electrographic development process
    Patent number: 4401740
    Abstract: An electrographic development process wherein an electrically charged developer comprising electrically conductive particles with a volume resistivity of 10.sup.9 .OMEGA.cm or less and toner particles with a volume resistivity of 10.sup.12 .OMEGA.cm or more, with the mixing ratio of the respective particles being from 1:99 to 40:60, is brought into contact, or proximity, with a latent electrostatic image with a polarity opposite to that of the electrically charged developer, and the latent electrostatic image is developed to a visible image by the developer, through the steps of supplying the developer to a developer doner member; forming a developer layer thereon with a thickness ranging from 150 .mu.m to 300 .mu.m; subjecting the developer to charge injection to a potential ranging from -150 V to -500 V; and supplying the developer to a latent electrostatic image bearing member for development of the latent electrostatic image thereon.
    Type: Grant
    Filed: January 5, 1982
    Date of Patent: August 30, 1983
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiyasu Kawabata, Hachiro Tosaka, Toshiki Nanya