Patents by Inventor Eiji Sawaoka

Eiji Sawaoka 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).

  • Electrophotographic copying machine
    Patent number: 4136941
    Abstract: An electrophotographic copying machine comprises a photoconductive drum rotatably disposed in the electrophotographic copying machine body, an original holder movable beyond one of the sides of the electrophotographic copying machine, a receptacle for receiving the copied paper and provided at the same side beyond which the original holder moves, a copy paper cassette provided at the same side as that at which the receptacle is provided, and a mechanism for transporting the copy paper from the copy paper cassette to the receptacle.
    Type: Grant
    Filed: January 14, 1977
    Date of Patent: January 30, 1979
    Assignee: Tokyo Shibaura Electric Co., Ltd.
    Inventor: Eiji Sawaoka
  • Copying machine with removable photosensitive drum
    Patent number: 4114998
    Abstract: An electrophotographic copying machine includes a photosensitive drum rotatably mounted in a housing. The drum may be taken out from the housing through an opening formed in the top wall thereof by a supporting mechanism when a covering for closing the opening is pivoted to open the opening.
    Type: Grant
    Filed: January 14, 1977
    Date of Patent: September 19, 1978
    Assignee: Tokyo Shibaura Electric Co., Ltd.
    Inventors: Wataru Shimizu, Eiji Sawaoka
  • Electrostatic copying apparatus with combined charging transfer unit
    Patent number: 4087170
    Abstract: An electrostatic copying apparatus comprising a rotatable drum having a photosensitive layer formed on the circumferential surface, the drum making two rotations for performing a series of copying functions including charging, exposure, development, transfer, discharge and cleaning. Charging exposure and development are effected in the first rotation of the drum, and transfer, discharge and cleaning in the second rotation. At least, a unit serving for both charging and transfer functions is incorporated in the apparatus.
    Type: Grant
    Filed: June 9, 1976
    Date of Patent: May 2, 1978
    Assignee: Tokyo Shibaura Electric Co., Ltd.
    Inventors: Eiji Sawaoka, Shinichi Hashimoto