Patents by Inventor Tsunayoshi Saito

Tsunayoshi Saito 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).

  • Magnetic recording medium
    Patent number: 4241139
    Abstract: A magnetic recording medium which has a protective layer on a magnetic recording layer coated on a substrate and said protective layer comprises polyurethane and nitrocellulose in which isopropyl alcohol originally present has been replaced by a resin selected from the group consisting of polyurethane resins, polybutadiene resins, butadiene-acrylonitrile copolymers, vinyl chloride-vinyl acetate-vinyl alcohol copolymers, vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinylidene chloride copolymers, vinylidene chloride-acrylonitrile-copolymers, vinyl acetate resins, epoxy resins, phenoxy resins, polyvinylbutyral resins, polyvinyl formal resins and polyester resins.
    Type: Grant
    Filed: April 5, 1979
    Date of Patent: December 23, 1980
    Assignees: TDK Electronics Co., Ltd., Tokyo Magnetic Printing Co., Ltd.
    Inventors: Yuichi Kubota, Tsunayoshi Saito, Yoshiaki Makino