Patents by Inventor Natsuko Inada

Natsuko Inada 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).

  • Low pressure mercury vapor electric discharge lamp and method of manufacturing the lamp
    Patent number: 5905333
    Abstract: This invention provides a low pressure mercury vapor electric discharge lamp composed of a glass bulb whose inner surface is coated with a fluorescent material film, the fluorescent material film contains a fluorescent material, pyrophosphate having an average grain size of 3.0 .mu.m or less and preferably 1.0 .mu.m or less, at least one of alkaline earth metal salt and nitrate, and a boric acid compound. According to the above arrangement, there can be obtained a low pressure mercury vapor electric discharge lamp having an improved fluorescent material film adhering strength, an improved total beam of light, a high beam of light maintaining ratio and a less amount of blacking.
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: May 18, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Chiharu Tomura, Natsuko Inada, Masahiko Yamakawa