Patents by Inventor Key Sato

Key Sato 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).

  • Digital scanner
    Patent number: 4694353
    Abstract: A digital scanner installed in an image reader of a digital facsimile apparatus, a digital copier or the like includes an analog-to-digital converter for quantizing a video signal which is produced by reading a document. A threshold voltage applied to the analog-to-digital converter from the outside is variable and specified from the outside.
    Type: Grant
    Filed: December 4, 1985
    Date of Patent: September 15, 1987
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsutomu Sato, Noboru Murayama, Key Sato