Patents by Inventor Kiyomi Ichizuka

Kiyomi Ichizuka 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).

  • Patent number: 4348470
    Abstract: The present invention provides an electrophotographic element which comprises a charge generating layer and a charge transport layer formed, in order, on an electroconductive substrate, said charge generating layer comprising a disazo pigment expressed by the general formula: ##STR1## [wherein A represents ##STR2## represents a member selected from the group consisting of benzene ring, naphthalene ring, indole ring, carbazole ring, benzofuran ring and their substitutes; Ar.sub.1 represents a member selected from the group consisting of benzene ring, naphthalene ring, dibenzofuran ring, carbazole ring and their substitutes; each of Ar.sub.2 and Ar.sub.3 represents a member selected from the group consisting of benzene ring, naphthalene ring and their substitutes; each of R.sub.1 and R.sub.3 represents a member selected from the group consisting of hydrogen, lower alkyl radical, phenyl radical and their substitutes; and R.sub.
    Type: Grant
    Filed: December 4, 1979
    Date of Patent: September 7, 1982
    Assignee: Ricoh Co., Ltd.
    Inventors: Akio Kozima, Eiichi Akutsu, Kiyomi Ichizuka
  • Patent number: 4293866
    Abstract: A recording apparatus wherein a liquid drop generator issues liquid drops which are steered to a strike at desired spots on an intermediate means so as to form a printing image to be transferred onto a recording sheet brought into contact therewith. The intermediate means includes a dye or pigment carrying layer, and the dye or pigment at the spot on the layer which has been wetted or moistened with the liquid drop becomes transferable to the recording sheet together with the liquid, whereby a visible printing image may be transferred onto the recording sheet.
    Type: Grant
    Filed: December 3, 1979
    Date of Patent: October 6, 1981
    Assignee: Ricoh Co., Ltd.
    Inventors: Seiki Takita, Kiyomi Ichizuka