Patents by Inventor Kiyozo Hashizume

Kiyozo Hashizume 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).

  • Cleaning method for use in electrophotography
    Patent number: 4640608
    Abstract: The cleaning method for use in an electrophotographic copying apparatus of the type removing toner images remaining on the surface of a photoconductor by a cleaning blade which includes the steps of bringing the cleaning blade into pressure contact with the photoconductor at least prior to the movement of the photoconductor, and moving the cleaning blade away from the surface of the photoconductor after the movement of the photoconductor is stopped with completion of copying process.
    Type: Grant
    Filed: April 6, 1981
    Date of Patent: February 3, 1987
    Assignee: Ricoh Co., Ltd.
    Inventors: Toshiaki Higaya, Masaaki Ogura, Takato Yano, Kiyozo Hashizume, Toshiyuki Ogawa, Nachio Seko
  • Powder material transportation apparatus
    Patent number: 4297021
    Abstract: The powder material transportation apparatus for transporting powder materials such as developer powder, by a rotating member such as a coil is provided with an agitator for destroying a bridge of powder material which is apt to be formed in an upper portion of the rotating member. The diameter or pitch of a rotating coil member is designed to be greater in a transportation termination portion than in a transportation initiation portion, whereby the powder material transportation force is increased in the transportation termination portion and formation of the bridge of powder material is prevented.
    Type: Grant
    Filed: June 6, 1979
    Date of Patent: October 27, 1981
    Assignee: Ricoh Company, Ltd.
    Inventors: Tatsuo Tani, Yasumori Nagahara, Sakae Ohta, Minoru Suzuki, Kiyozo Hashizume