Patents Assigned to Yoshida Koygyo K.K.
  • Method of forming coupling head portions in production of slide fastener coupling element
    Patent number: 5119534
    Abstract: In a method of forming coupling head portions on a monofilament of thermoplastic synthetic resin for production of a slide fastener coupling element, the monofilament is stamped from one side to form recessed small-thickness portions bulging from the other side of the monofilament, and then the monofilament is bent at opposite ends of each of the recessed small-thickness portions in such a manner that the concave side of each small-thickness portions faces outwardly.
    Type: Grant
    Filed: March 26, 1991
    Date of Patent: June 9, 1992
    Assignee: Yoshida Koygyo K.K.
    Inventors: Yoshinori Fujisaki, Sakae Aimono