Patents by Inventor Haruyoshi Masui

Haruyoshi Masui 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).

  • Ink jet printer
    Patent number: 4661822
    Abstract: An ink jet printer includes a pump which pressurizes an ink to be supplied to a nozzle, which projects an ink jet. When the ink pressure which is supplied to the nozzle exceeds a given value or when the deflection of the ink jet is improper, pressure oscillations are applied to the nozzle by alternately and repeatedly driving and ceasing to drive the pump in order to remove a plugging of the nozzle. If the repeated operation does not result in a reduced ink pressure, the nozzle is connected to a low pressure ink vessel, causing the pressure prevailing within the nozzle to be reduced.
    Type: Grant
    Filed: March 10, 1986
    Date of Patent: April 28, 1987
    Assignee: Ricoh Company, Ltd.
    Inventors: Tetsuro Hirota, Shigeyuki Araki, Shizuo Yokoyama, Haruyoshi Masui, Toshitaka Hirata