Patents by Inventor Katsunori Oba

Katsunori Oba 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).

  • Phthalocyanine compound and electrophotographic photoreceptor comprising same
    Patent number: 6008346
    Abstract: The present invention provides an electrophotographic photoreceptor which can be prepared so easily as to exhibit a photosensitivity well-adjusted for the respective type of machine in the dip coating method, which is an ordinary method for the preparation of an electrophotographic photoreceptor. A novel electrophotographic photoreceptor is provided comprising a charge-transporting layer and a charge-generating layer provided on an electrically-conductive support, wherein the charge-generating layer is a layer comprising a charge-generating material containing a phthalocyanine compound represented by the following general formula (1) dispersed in a resin: ##STR1## wherein Ar.sup.1 and Ar.sup.2 each independently represent an orthophenylene group which may have a substituent; and Pc represents an unsubstituted or substituted phthalocyanine residue.
    Type: Grant
    Filed: April 30, 1999
    Date of Patent: December 28, 1999
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Yoshitaka Saito, Katsunori Oba, Shinichi Okada
  • Phthalocyanine compound and electrophotographic photoreceptor comprising same
    Patent number: 5932382
    Abstract: The present invention provides an electrophotographic photoreceptor which can be prepared so easily as to exhibit a photosensitivity well-adjusted for the respective type of machine in the dip coating method, which is an ordinary method for the preparation of an electrophotographic photoreceptor. A novel electrophotographic photoreceptor is provided comprising a charge-transporting layer and a charge-generating layer provided on an electrically-conductive support, wherein the charge-generating layer is a layer comprising a charge-generating material containing a phthalocyanine compound represented by the following general formula (1) dispersed in a resin: ##STR1## wherein Ar.sup.1 and Ar.sup.2 each independently represent an orthophenylene group which may have a substituent; and Pc represents an unsubstituted or substituted phthalocyanine residue.
    Type: Grant
    Filed: November 7, 1997
    Date of Patent: August 3, 1999
    Assignee: Dainippon Ink & Chemicals, Inc.
    Inventors: Yoshitaka Saito, Katsunori Oba, Shinichi Okada