Patents by Inventor Touru Ishii

Touru Ishii 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).

  • Bisazo compounds
    Patent number: 4889924
    Abstract: A bisazo compound having good electrophotographic properties is disclosed, which is represented by formula (I) ##STR1## wherein X represents a hydrogen atom, a chlorine atom or a nitro group. A process for producing the bisazo compound is also disclosed.
    Type: Grant
    Filed: October 2, 1987
    Date of Patent: December 26, 1989
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yutaka Akasaki, Akihiko Tokita, Kaoru Torikoshi, Akira Imai, Touru Ishii
  • Electrophotographic photoreceptor having a bisazo compound
    Patent number: 4822704
    Abstract: An electrophotographic photoreceptor is disclosed, comprising a conductive support having provided thereon a photosensitive layer containing a bisazo compound respresented by formula (I) ##STR1## wherein Y represents a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, a cyano group, a nitro group or a hydroxyl group; and A represents a substituted or unsubstituted divalent aromatic hydrocarbon group or a substituted unsubstituted divalent nitrogen-containing heterocyclic group. The photoreceptor exhibits excellent sensitivity and durability.
    Type: Grant
    Filed: July 31, 1987
    Date of Patent: April 18, 1989
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yutaka Akasaki, Akihiko Tokita, Kaoru Torikoshi, Akira Imai, Touru Ishii
  • Electrophotographic photoreceptor having a bisazo compound
    Patent number: 4820600
    Abstract: An electrophotographic photoreceptor is disclosed, comprising a conductive support having provided thereon a photosensitive layer containing a bisazo compound represented by formula (I) ##STR1## wherein X represents a halogen atom or a nitro group, and A represents a substituted or unsubstituted divalent aromatic hydrocarbon group or a substituted unsubstituted divalent nitrogen-containing heterocyclic group. The photoreceptor exhibits excellent sensitivity and durability.
    Type: Grant
    Filed: August 5, 1987
    Date of Patent: April 11, 1989
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yutaka Akasaki, Akihiko Tokita, Kaoru Torikoshi, Akira Imai, Touru Ishii