Patents by Inventor Sadaharu Doi

Sadaharu Doi 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).

  • Apparatus for manufacturing fluorescent lamps
    Patent number: 4362123
    Abstract: A phosphor suspension is prepared by adding to an aqueous solution of a polyethylene oxide, a phosphor, a phosphate or a borate of an alkali metal and a phosphor bonding agent. After having passed through a filter, the phosphor suspension flows down on the inner surface of a glass bulb of a fluorescent lamp to form a phosphor layer on it. The coated bulb is heated to a temperature which is not higher than its softening temperature while it is transported along two opposite guide rails by two endless conveyors by having both end portions supported by associated guide tips on the conveyors projecting above the guide rails.
    Type: Grant
    Filed: October 21, 1980
    Date of Patent: December 7, 1982
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hitoshi Yamazaki, Hiroshi Ito, Sadaharu Doi, Jun Imai, Hiroshi Takada
  • Method of manufacturing fluorescent lamps
    Patent number: 4308297
    Abstract: A phosphor suspension is prepared by adding to an aqueous solution of a polyethylene oxide, a phosphor, a phosphate or a borate of an alkali metal and a phosphor bonding agent. After having passed through a filter, the phosphor suspension flows down on the inner surface of a glass bulb of a fluorescent lamp to form a phosphor layer thereon. The coated bulb is heated to a temperature which is not higher than its softening temperature while it is transported along two opposite guide rails by two endless conveyors by having both end portions supported by associated guide tips on the conveyors projecting above the guide rails.
    Type: Grant
    Filed: March 5, 1980
    Date of Patent: December 29, 1981
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hitoshi Yamazaki, Hiroshi Ito, Sadaharu Doi, Jun Imai, Hiroshi Takada