Patents by Inventor Yoshinori Ohtaka

Yoshinori Ohtaka 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).

  • Shatter-proof fluorescent lamp
    Patent number: 5124618
    Abstract: A shatter-proof fluorescent lamp which includes a glass tube, electrodes connected to opposite terminal ends of the glass tube, a phosphor layer coated on the inside surface of the glass tube, a gaseous mixture containing mercury and rare gases confined in the glass tube, at least one ultraviolet ray absorbing layer capable of absorbing ultraviolet rays of 400 nm or less formed on the glass tube, and a transparent polymer resin layer formed on the ultraviolet ray absorbing layer.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: June 23, 1992
    Assignee: Matsushita Electronics Corporation
    Inventors: Yoshinori Ohtaka, Haruo Shibata, Toyokazu Amano, Mutsuo Takahashi, Shigeru Kamiya