Patents by Inventor Mieko Toyama

Mieko Toyama 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 photoreceptor, and an image-forming method and apparatus for using the same
    Patent number: 5998072
    Abstract: An electrophotographic photoreceptor and image forming manhood using the same are disclosed. The photoreceptor comprises a sublayer between the support and the photosensitive layer containing fine resin particles. A clear and sharp image is formed without generating interference fringes.
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: December 7, 1999
    Assignee: Konica Corporation
    Inventors: Fumitaka Mochizuki, Kenichi Yasuda, Mieko Toyama
  • Photoreceptor for electrophotography
    Patent number: 5804345
    Abstract: An electrophotographic photoreceptor comprising a charge transport material and an anti-oxidant in the charge transport layer is disclosed. The transport material has a carbon atom of which the charge density on aforesaid carbon atom in an aromatic ring is smaller than -0.16 when aforesaid charge transport material is in a positive hole state due to being one electron-oxidation, and the anti-oxidant has oxidation potential (V) satisfying Formula,0.1(V).ltoreq.E.sub.OX -E.sub.T .ltoreq.1.0(V)wherein E.sub.OX is oxidation potential of the anti-oxidant, and E.sub.T is oxidation potential of the charge transport material. The thickness of the charge transport layer is 25 .mu.m or more.
    Type: Grant
    Filed: October 31, 1997
    Date of Patent: September 8, 1998
    Assignee: Konica Corporation
    Inventors: Akihiko Itami, Mieko Toyama, Masaru Sano