Patents Assigned to Tokan Kogyo Kabushiki Kaisha
  • Easily openable cover member
    Patent number: 4324341
    Abstract: An easily openable cover member for a container which is formed from thermoplastic synthetic resin of high flexibility and which integrally has unsealing means for opening an openable portion defined by a thinned portion and said unsealing means is integral with and extends upwardly of the openable portion. The cover member has been formed by injection-molding synthetic resin so as to have the openable portion integrally formed with the unsealing means.
    Type: Grant
    Filed: June 18, 1980
    Date of Patent: April 13, 1982
    Assignee: Tokan Kogyo Kabushiki Kaisha
    Inventors: Kisaburo Yamaguchi, Tsukasa Yoshikawa
  • Easily openable cover member
    Patent number: 4324342
    Abstract: An easily openable cover member for a container which is formed from thermoplastic synthetic resin of high flexibility and which integrally has unsealing means for opening an openable portion defined by a thinned portion and said unsealing means is integral with and extends upwardly of the openable portion. The cover member has been formed by injection-molding synthetic resin so as to have the openable portion integrally formed with the unsealing means.
    Type: Grant
    Filed: June 18, 1980
    Date of Patent: April 13, 1982
    Assignee: Tokan Kogyo Kabushiki Kaisha
    Inventors: Kisaburo Yamaguchi, Tsukasa Yoshikawa
  • Easily openable cover member
    Patent number: 4256239
    Abstract: An easily openable cover member for a container which is formed from thermoplastic synthetic resin of high flexibility and which integrally has unsealing means for opening an openable portion defined by a thinned portion and said unsealing means is integral with and extends upwardly of the openable portion. The cover member has been formed by injection-molding synthetic resin so as to have the openable portion integrally formed with the unsealing means.
    Type: Grant
    Filed: July 9, 1979
    Date of Patent: March 17, 1981
    Assignee: Tokan Kogyo Kabushiki Kaisha
    Inventors: Kisaburo Yamaguchi, Tsukasa Yoshikawa