Patents by Inventor Noribuma Koitabashi

Noribuma Koitabashi 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).

  • Image correction method in inkjet recording apparatus
    Patent number: 7327503
    Abstract: A method of preventing image degradation due to nonejecting nozzles of a recording head is provided for an inkjet recording apparatus for recording images by ejecting ink from plural nozzles disposed in the recording head. The method according to the present invention includes the steps of measuring and recording a pattern for checking an ejection state of the head, determining a nonejecting nozzle from the pattern, obtaining density distribution for each nozzle, and determining a complementary table for every nozzle from the density distribution in the nonejecting nozzle portion for performing different-color complementing.
    Type: Grant
    Filed: October 29, 2002
    Date of Patent: February 5, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masataka Yashima, Noribuma Koitabashi, Tsuyoshi Shibata