Patents by Inventor Ituso Ikeda

Ituso Ikeda 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).

  • Color electrophotographic copying process
    Patent number: 4690541
    Abstract: A color electrophotographic copying process utilizing the Carlson process. A colored original to be copied is color-separated and read by a solid-state image pickup device. Color compensation or gradation compensation is carried out on the basis of the data read by the solid-state image pickup device. When the color compensation is effected, amounts of masking are determined on the basis of the data read by the solid-state image pickup device, and the color-separated latent images are partially erased in an area-modulating manner dependent on the determined amounts of masking with an eraser having a light-emitting dot array. When the gradation compensation is effected, the latent images are partially erased with the eraser in an area-modulating manner dependent on the determined amounts of masking, or an appropriate gradation reproduction curve is selected on the basis of the data read by the solid-state image pickup device.
    Type: Grant
    Filed: August 30, 1985
    Date of Patent: September 1, 1987
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshihiro Sakai, Ituso Ikeda, Katsuo Sakai, Tsukasa Adachi, Satoshi Shinguryo, Hideya Furuta