Patents by Inventor Shigetake Sato

Shigetake Sato 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).

  • Process for continuous preparation of a foam polyamide
    Patent number: 4028287
    Abstract: Method for the preparation of a foam polyamide in which the lactam together with a basic catalyst at a temperature above the melting point of the lactam is mixed with the promoter and foaming agent in a mixing vessel at ambient temperature while subjecting the mix to violent agitation to initiate polymerization, and the mix is discharged into a container for completion of the reaction before polymerization is more than 10% complete.
    Type: Grant
    Filed: June 4, 1975
    Date of Patent: June 7, 1977
    Assignee: Bridgestone Tire Company Limited
    Inventors: Shigetake Sato, Suminobu Kurahashi, Toru Okuyama, Noboru Hamada
  • Process for producing polyamide foam
    Patent number: 4022719
    Abstract: Methods of preparing polyamide foam comprising polymerizing and foaming a mixture of one or more specified lactams, a basic alkali metal lactam catalyst, an alkyl isocyanate activator and a foaming agent at a temperature above the melting point of the lactam, and below the melting point of the polyamide foam thus produced.
    Type: Grant
    Filed: May 12, 1975
    Date of Patent: May 10, 1977
    Assignee: Bridgestone Tire Company Limited
    Inventors: Toru Okuyama, Susumu Muta, Suminobu Kurahashi, Shigetake Sato