Patents by Inventor Kitaro Shigeta

Kitaro Shigeta 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).

  • Thermal transfer recording sheet
    Patent number: 5677062
    Abstract: A thermal transfer recording sheet comprising a base film, a thermally transferable ink layer formed on one side of the base film, a heat resistant lubricating layer formed on the other side of the base film, wherein the total concentration of alkali metal ions and alkaline earth metal ions contained in the heat resistant lubricating layer is within a range of at most 4 .mu.g/cm.sup.2.
    Type: Grant
    Filed: October 26, 1995
    Date of Patent: October 14, 1997
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Katsuhiko Kuroda, Kitaro Shigeta, Hideo Shinohara
  • Process for producing calcium tungstate phosphor
    Patent number: 5268125
    Abstract: A calcium tungstate phosphor which comprises calcium tungstate as a host and vanadium, wherein the proportion of the vanadium to the calcium tungstate is within a range of from 0.01 to 30 ppm. The phosphor is produced by forming a solid calcium tungstate precipitate from an aqueous medium containing ammonia, calcium ion, tungstate ion and vanadate ion and firing the precipitate in the presence of fluxing material.
    Type: Grant
    Filed: September 23, 1992
    Date of Patent: December 7, 1993
    Assignees: Kasei Optonix, Ltd., Mitsubishi Kasei Corporation
    Inventors: Hideo Suzuki, Etsuo Shimizu, Yujiro Suzuki, Kitaro Shigeta, Takashi Johnokuchi