Patents by Inventor Tatsuya Eida

Tatsuya Eida 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
    Patent number: 4735839
    Abstract: An optical information recording medium comprises a plastic substrate and a recording layer containing an indole type polymethine compound wherein the substituents attached to N atoms in the indole and indolene rings must be different from each other. The compound provides high solubility in alcoholic solvents, high storage stability (light resistance, heat resistance, etc.) and the like.
    Type: Grant
    Filed: June 26, 1986
    Date of Patent: April 5, 1988
    Assignee: Ricoh Co., Ltd.
    Inventors: Tsutomu Sato, Tatsuya Eida, Keiko Ichinose