Patents by Inventor Shoichi Sugiyama

Shoichi Sugiyama 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).

  • Master batch pigment, toner including the master batch pigment and method for manufacturing the toner
    Patent number: 6569590
    Abstract: A method is provided for manufacturing a master batch pigment for a toner, including the steps of mixing a dry pigment powder, a binder resin and water to prepare a mixture thereof; and kneading the mixture upon application of heat to prepare the master batch pigment, wherein the master batch pigment has a weight loss of from 0.01 to 1.0% when heated at 110° C. for 2 hrs.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: May 27, 2003
    Assignee: Ricoh Company Limited
    Inventors: Noboru Kuroda, Shoichi Sugiyama
  • Master batch pigment, toner including the master batch pigment and method for manufacturing the toner
    Publication number: 20020048712
    Abstract: A method is provided for manufacturing a master batch pigment for a toner, including the steps of mixing a dry pigment powder, a binder resin and water to prepare a mixture thereof; and kneading the mixture upon application of heat to prepare the master batch pigment, wherein the master batch pigment has a weight loss of from 0.01 to 1.0% when heated at 110° C. for 2 hrs.
    Type: Application
    Filed: August 24, 2001
    Publication date: April 25, 2002
    Applicant: Ricoh Company Limited Ohta-ku, Japan
    Inventors: Noboru Kuroda, Shoichi Sugiyama
  • Thermosensitive stencil paper
    Patent number: 5219637
    Abstract: A thermosensitive stencil paper is composed of a thermosensitive stencil film and an overcoat layer formed thereon which contains a higher-alcohol-ester-modified silicone oil as a sticking-prevention agent. A porous substrate may be attached to the back side of the stencil film by use of an adhesive agent.
    Type: Grant
    Filed: January 3, 1992
    Date of Patent: June 15, 1993
    Assignee: Ricoh Company, Ltd.
    Inventors: Fumiaki Arai, Masayasu Nonogaki, Shoichi Sugiyama, Yuji Natori, Hideyuki Yamaguchi
  • Thermosensitive stencil paper
    Patent number: 5188881
    Abstract: A thermosensitive stencil paper is composed of a substrate and a thermoplastic resin film formed thereon, which thermoplastic resin film has projections in the surface portion thereof, with a printing roughness (R.sub.p) of 2.2 to 5.0 .mu.m, which is a physical quantity proportional to the average depth of the depressions in the surface portion thereof pressed against a standard surface.
    Type: Grant
    Filed: June 20, 1991
    Date of Patent: February 23, 1993
    Assignees: Ricoh Company, Ltd., Teijin Ltd.
    Inventors: Shoichi Sugiyama, Fumiaki Arai, Masayasu Nonogaki, Yuji Natori, Hideyuki Yamaguchi, Hitoshi Ueda, Hiroshi Tomita, Kotaro Kato