Patents by Inventor Akihiko Isao

Akihiko Isao 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 forming an inhomogeneous optical layer
    Patent number: 4416217
    Abstract: An inhomogeneous optical layer is formed on a surface of a substrate in a vacuum coater, in which the substrate is moved along a travelling path having path sections and two substances are evaporated from their respective sources and both of the substances are deposited on a common surface section of the surface. In such an operation, the deposition rate of each of the substances is varied monotonously along the path in each of the path section in order that, in a layer formed by the deposition on the substrate, the content of each of the substances is varied monotonously in the direction of thickness. If the refractive index of one of the substances is different from that of the other of the substances, the resultant refractive index in the layer is varied monotonously in the direction of the thickness of the layer.
    Type: Grant
    Filed: April 29, 1982
    Date of Patent: November 22, 1983
    Assignees: Ulvac Seimaku Kabushiki Kaisha, Nihon Shinku Gijutsu Kabushiki Kaisha
    Inventors: Kazuo Nakamura, Hirotsugu Mizorogi, Akihiko Isao