Patents by Inventor Ichiro Takegawa

Ichiro Takegawa 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).

  • Multi-layered squarylium-based positive charge electrophotographic photoreceptor
    Patent number: 4948687
    Abstract: An electrophotographic photoreceptor for use in positive charging electrophotographic machines is disclosed, comprising an electrically conductive substrate having thereon a charge transporting layer, a charge generating layer, and a low resistance surface protective layer, in that order, wherein a squarylium acid derivative having an asymmetrical structure represented by the formula (I): ##STR1## wherein R.sub.1 and R.sub.2 may be the same or different and represent a --CH.sub.3 group or a ##STR2## group (wherein Y represents a halogen atom), and X.sub.1 and X.sub.2 may be the same or different and represent a hydrogen atom, an --OH group or a halogen atom, is dispersed in said charge generating layer.
    Type: Grant
    Filed: December 30, 1988
    Date of Patent: August 14, 1990
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Masanori Murase, Ichiro Takegawa, Makoto Takemoto, Yasuo Sakaguchi