Patents by Inventor Naohisa Tohjoh

Naohisa Tohjoh 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).

  • Color filter for liquid crystal displays
    Patent number: 5897981
    Abstract: A color filter for liquid crystal displays, has a red colored layer wherein a first red pigment where a 40%-transmittance wavelength at a short-wave end of a transmitted spectrum (short-wave 40%-transmittance wavelength) is in a range of 550 to 600 NM and a second red pigment where the short-wave 40%-transmittance wavelength is within 40 NM from the range of the first red pigment are mixed so that transmittance in a wavelength region of 450 to 500 NM is substantially 0%.
    Type: Grant
    Filed: June 6, 1997
    Date of Patent: April 27, 1999
    Assignee: International Business Machines Corporation
    Inventors: Kesanao Kobayashi, Takashi Fujita, Naoyuki Tsujimura, Naohisa Tohjoh