Patents by Inventor Kiyohito Hagiwara

Kiyohito Hagiwara 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).

  • Print speed controlled dot line printer depending on print density
    Patent number: 5662421
    Abstract: To prevent undue elevation of temperature in a hammer assembly but to maintain the maximum printing speed, when a scheduled number of drivings at which print hammers are to be driven during one scan of a manner bank which follows the currently performing scan, exceeds a first reference number, one dot line printing is completed with a plurality of scans of the hammer bank so that dot line print density in each scan of the hammer bank does not exceed, for example, 35%. If, however, high density printing exceeding 25% continues for an extended period of time more than one scan time, the printing operation is temporarily halted.
    Type: Grant
    Filed: April 24, 1995
    Date of Patent: September 2, 1997
    Assignee: Hitachi Koki Company, Ltd.
    Inventors: Kiyohito Hagiwara, Yoshikane Matsumoto, Shingo Nakahara, Masami Iwama