Patents by Inventor Noboru Kutsuwada

Noboru Kutsuwada 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).

  • Method for controlling image formation in electrophotography by pre-exposure step
    Patent number: 4288514
    Abstract: A photosensitive member is exposed to light prior to primary charging so that the surface potential applied by primary charging may always be maintained at a constant level to which the photosensitive member is always charged when it is repetitively used for some time, which may be predetermined by test. Until the surface potential reaches this level, the intensity of light for pre-exposure is gradually decreased and after the surface potential has reached this level, no pre-exposure is applied. But when the surface potential rises after a predeterminable period during which the photosensitive member is not used, the pre-exposure is applied again. All the copies may have the same density.
    Type: Grant
    Filed: September 7, 1977
    Date of Patent: September 8, 1981
    Assignee: Canon Kabushiki Kaisha
    Inventors: Noboru Kutsuwada, Minoru Saito, Ryoichi Namiki, Katsuo Kusunoki