Patents by Inventor Yoshinori Nakawawa

Yoshinori Nakawawa 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).

  • Method for superplastic warm-die and pack forging of high-strength low-ductility material
    Patent number: 4867807
    Abstract: A high-strength low-ductility material is formed by a method which comprises treating a bulk or powder of the material thereby converting coarse grains thereof into hyperfine grains capable of manifesting superplasticity when the strain rate is higher than 5.times.10.sup.-3 s.sup.-1, enclosing the treated material with a metallic insulating member, heating the material to a temperature for manifestation of superplasticity, and forging the material by the use of a die in a state heated to a temperature beyond which the die yields to heat.
    Type: Grant
    Filed: December 5, 1986
    Date of Patent: September 19, 1989
    Assignee: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Yasunori Torisaka, Masahito Katoh, Yoshinori Nakawawa