Patents by Inventor Yoshiaki Takaynagi

Yoshiaki Takaynagi 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 with residual ink detection that compensates for different ink properties
    Patent number: 5162817
    Abstract: An ink jet recording apparatus comprises an ink jet head having an ink path communicating with a discharge opening for discharging ink; electrodes arranged in said ink path; a residual ink quantity detection means for detecting residual ink quantity in said ink path in accordance with a resistance value, current value or voltage value from said electrodes; and a correction means for correcting said resistance value, current value or voltage value in accordance with the difference in a resistance of the ink. This enables the correction means to compensate for different ink resistances and thus provide accurate residual ink detection even when different inks are used or ink resistance changes because of a change in ambient conditions.
    Type: Grant
    Filed: August 7, 1991
    Date of Patent: November 10, 1992
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroshi Tajika, Hiromitsu Hirabayashi, Atsushi Arai, Noribumi Koitabashi, Yoshiaki Takaynagi