Patents by Inventor Kumiko Izawa

Kumiko Izawa 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).

  • Image forming apparatus with preconditioning exposure selectively forming a multi-color and mono-color image
    Patent number: 4933721
    Abstract: An image forming apparatus wherein in multi-color mode a multi-color image is formed by repeating a series of uniform charging, image exposing and developing steps to form a plurality of color toner image on a surface of an image retainer, and transferring the color toner image to a transfer material, and wherein in mono-color mode a mono-color image is formed by uniform charging, image exposing and developing in a single step to form a mono-color toner image on the surface of the image retainer, and transferring the mono-color toner image to a transfer material one of the modes being selected. The image retainer is exposed uniformly before the uniform charging step.
    Type: Grant
    Filed: April 4, 1988
    Date of Patent: June 12, 1990
    Assignee: Konishirpku Photo Industry Co., Ltd.
    Inventors: Kazuo Yasuda, Kumiko Izawa, Hiroshi Tokunaga