Patents by Inventor Yoshikatsu Aihara

Yoshikatsu Aihara 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).

  • Patent number: 5435938
    Abstract: Electrolytes are attached to fluorescent particle surfaces to prevent open spots in cathode-ray tube coatings dried at high temperatures. Electrolytes that are sulfates, nitrates, or chlorides of alkali or alkaline-earth metals are added to a liquid suspension of fluorescent particles which have passed through a cleaning step. Electrolytes are added to the suspension to make the conductivity of the clear top liquid greater than 30 .mu..OMEGA..sup.-1 cm.sup.-1. The fluorescent particle preparation process is finished with a final dehydration and drying step.
    Type: Grant
    Filed: March 10, 1994
    Date of Patent: July 25, 1995
    Assignee: Nichia Chemical Industries, Ltd.
    Inventors: Shoichi Bando, Yoshikatsu Aihara
  • Patent number: 5330791
    Abstract: A method of reclaiming a phosphor from a recovered phosphor slurry containing carbon, a bichromate, and polyvinyl alcohol, comprises, (a) a decomposition treatment step of adding an alkali to the recovered phosphor slurry after the slurry is heated to prepare a phosphor suspension having an alkali concentration of 0.5N or less in the slurry, and adding an oxidizing agent in an amount of 1.0 to 20.0 wt % with respect to a dry solid component of the suspension, (b) a weak acid treatment step of separating a phosphor from the suspension, and adding a weak acid to a suspension obtained by adding water to the separated phosphor, thereby adjusting a pH to be 3.0 to 5.0, and (c) a surface treatment step of treating the surface of the phosphor separated from the suspension.
    Type: Grant
    Filed: April 16, 1993
    Date of Patent: July 19, 1994
    Assignee: Nichia Kagaku Kogyo K.K.
    Inventors: Yoshikatsu Aihara, Tomokazu Suzuki, Yoshiaki Shizuki, Shoichi Bando, Katsunori Uchimura