Patents by Inventor Eiichi Takazawa

Eiichi Takazawa 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).

  • Nonreflective coating
    Patent number: 4313647
    Abstract: A nonreflective coating is made up of five or seven layers of optical films provided on an optical element, such as a lens, whose refractive index is in a certain refractive index range for a particular light wavelength. The layers are formed of two materials different in refractive index so that the odd layers have one of the two refractive indexes while the even layers have the other refractive index, and the thicknesses of the layers are suitably defined as functions of the light wavelength.
    Type: Grant
    Filed: January 2, 1980
    Date of Patent: February 2, 1982
    Assignee: Mamiya Koki Kabushiki Kaisha
    Inventor: Eiichi Takazawa