Patents by Inventor Atsuhiko Matsumoto

Atsuhiko Matsumoto 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).

  • Gradation control circuit for a thermal head
    Patent number: 5142301
    Abstract: A gradation control circuit for a thermal head used for printing an image or the like preferably includes a shift register for receiving gradation data, a selection circuit for selecting one gradation data corresponding to one exothermic element, a decision circuit for determining the level of the data, and a switching element for controlling the heating time of the exothermic element based on the determined level of the data.
    Type: Grant
    Filed: December 19, 1990
    Date of Patent: August 25, 1992
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Atsuhiko Matsumoto