Patents by Inventor Hideaki Ohba

Hideaki Ohba 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 information recording medium, information recording method and optical information recording system using the medium
    Patent number: 5002812
    Abstract: An optical information recording medium comprising a substrate; a recording layer comprising as the main component an organic dye component, formed on the substrate, which recording layer has a maximum peak in the spectroscopic reflectance thereof near the wavelength of the information recording and reproduction light, and has a thickness at which the spectroscopic reflectance thereof is maximized at the wavelength of the information recording and reproduction light, and an optical information recording method, and a system for recording and/or reproducing information using this recording medium are disclosed.
    Type: Grant
    Filed: June 14, 1989
    Date of Patent: March 26, 1991
    Assignee: Ricoh Company, Ltd.
    Inventors: Masaakira Umehara, Tsutomu Satoh, Hideaki Ohba, Keiko Ichinose