Patents by Inventor Kengo Hirai

Kengo Hirai 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).

  • Polytetrafluoroethylene filamentary material
    Patent number: 5470655
    Abstract: A filamentary material of polytetrafluoroethylene (PTFE) having an apparent density of 2.0 g/cc or more, tensile strength of 5 grams/denier or more, tensile elongation at break of 15% or more, high axial orientation and high crystalline content is disclosed. The filamentary material, when analyzed by differential scanning calorimetry, exhibits two endothermic peaks; the ratio of the energy defined by the higher temperature peak to the energy defined by the lower temperature peak being equal to or greater than 2.
    Type: Grant
    Filed: September 15, 1994
    Date of Patent: November 28, 1995
    Assignee: Japan Gore-Tex, Inc.
    Inventor: Kengo Hirai