Patents by Inventor by Mankichi Katoh, legal representative

by Mankichi Katoh, legal representative 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).

  • Layered electrophotographic photoconductor containing a hydrazone
    Patent number: 4481271
    Abstract: A layered electrophotographic photoconductor whose charge generation layer comprises a bisazo pigment selected from the group consisting of the bisazo pigments represented by the following general formula (I) and whose charge transport layer contains a charge transport material selected from the group consisting of the hydrazone compounds represented by the following general formula (2): ##STR1## wherein A represents --C.sub.6 H.sub.4 --Cl(o), --C.sub.6 H.sub.4 --Cl(m), --C.sub.6 H.sub.4 --Br(o), --C.sub.6 H.sub.4 --Br(m), --C.sub.6 H.sub.4 --F(o), --C.sub.6 H.sub.4 --F(m), --C.sub.6 H.sub.4 --F(p), or --C.sub.6 H.sub.4 --I(m), ##STR2## wherein R.sup.
    Type: Grant
    Filed: December 14, 1981
    Date of Patent: November 6, 1984
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsuru Hashimoto, Kiyoshi Sakai, Toshio Fukagai, Tatsuya Katoh, deceased, by Mankichi Katoh, legal representative