Patents by Inventor Akihisa Hirasawa

Akihisa Hirasawa 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 filing system for protecting partial regions of image data of a document
    Patent number: 5235681
    Abstract: A partial region of an image is set as being a secret region and an ID code is put to data concerning this secret region, the data then being stored in a memory, so that, unless an ID code which is input from a keyboard is coincident with the stored ID code, the image is selectively prevented from being displayed on a CRT display, printed by a printer, or subjected to additional writing, revision, cutting on the display screen. Thus, it is possible to restrict the visual output or revision of secret portions of images and therefore possible to individually control images which need to be kept secret and those which need not.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: August 10, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Hidefumi Masuzaki, Satoshi Ito, Hiromichi Fujisawa, Masaaki Fujinawa, Nobuyuki Minowa, Akihisa Hirasawa