Patents by Inventor Ryozo Sawada

Ryozo Sawada 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).

  • Slide fastener made of synthetic resin
    Patent number: 5500276
    Abstract: A slide fastener of synthetic resin which has regularly spaced elements formed and fixed to the edge of fastener tape by the injection molding of the molten mass of the synthetic resin is disclosed. The fastener tape is formed of polyethylene terephthalate and the elements of slide fastener are made of a polymer alloy of polybutylene terephthalate with polypropylene or polyethylene terephthalate.
    Type: Grant
    Filed: June 22, 1994
    Date of Patent: March 19, 1996
    Assignee: Yoshida Kogyo K.K.
    Inventors: Ryozo Sawada, Masanori Hirasawa, Yoshiharu Yamaguchi, Shigeru Funakawa, Masaru Kanayama