Patents by Inventor Akiko Hagiuda

Akiko Hagiuda 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).

  • Optical interference film having high and low refractive index layers inter-layer connection of which is strengthened
    Patent number: 4983001
    Abstract: An optical interference film being formed by alternately accumulating a low refractive index layer and a high refractive index layer having a prescribed refractive index higher than the low refractive index layer. The high refractive index layer includes at least one metal oxide selected from titanium oxide and tantalum oxide. The low refractive index layer includes silica and a prescribed amount of at least one metal oxide the same as that in the high refractive index layer to avoid inter-layer peeling of high and low refractive index layers.
    Type: Grant
    Filed: August 22, 1988
    Date of Patent: January 8, 1991
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akiko Hagiuda, Akira Kawakatsu