Patents by Inventor Soichi Hasegawa

Soichi Hasegawa 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).

  • Reversible thermal-recording composite and rewritable reversible thermal-recording sheet and card using the same
    Patent number: 5972837
    Abstract: A reversible thermal-recording composite capable of exerting great performance for repeated use and yielding good printing quality at higher coloring concentrations is provided, wherein the coloring and fading reaction of a leuco dye with a coloring and fading agent is utilized and a specific coloring and fading agent, a specific inorganic filler and a specific amine compound and the like are used in the thermal-recording layer, and a thermal-recording sheet and a thermal-recording card using the same are also provided.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: October 26, 1999
    Assignee: Sliontec Corporation
    Inventors: Shoko Satoh, Kazuyoshi Yatsushige, Soichi Hasegawa, Kazuo Nate
  • Electrophotographic element having separate charge generating and charge transporting layers
    Patent number: 5053303
    Abstract: An electrophotographic photosensitive material suitable for application to a laser beam printer is disclosed which includes an electrically conductive support having provided thereon a charge generating layer containing an X-form, metal-free phthalocyanine and a charge transporting layer containing a specific butadiene compound, hydrazone compound or pyrazoline compound. The charge transporting layer may be prepared by coating with a solution containing the specific compound, a polycarbonate resin and a dioxane-containing solvent.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: October 1, 1991
    Assignee: Somar Corporation
    Inventors: Junei Sakaguchi, Soichi Hasegawa, Shuichi Arai
  • Electrophotographic photosensitive material and method of preparing same
    Patent number: 5049465
    Abstract: An electrophotographic photosensitive material suitable for application to a lazer beam printer is disclosed which includes an electrically conductive support having provided thereon a charge generating layer containing a titanium phthalocyanine pigment and a charge transporting layer containing a specific hydrazone compound. The charge transporting layer may be prepared by coating with a solution containing the specific compound, a polycarbonate resin and a dioxane-containing solvent.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: September 17, 1991
    Assignee: Somar Corporation
    Inventors: Junei Sakaguchi, Soichi Hasegawa, Shuichi Arai