Patents by Inventor Tosio Sasayama

Tosio Sasayama 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).

  • Twist drill
    Patent number: 4756650
    Abstract: A twist drill including a body characterized by the outer portion of each of the heels bulging toward the main flute as compared with that of the standard twist drill, the main lips each bulging in a triangular shape in cross section toward the main flute as compared with that of the standard twist drill, and a subflute having a substantially U-shaped cross section and axially formed in the inner portion adjacent to the axis of the twist drill of each of the heels along the main flute for a predetermined distance from the tip.
    Type: Grant
    Filed: November 26, 1986
    Date of Patent: July 12, 1988
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Koichiro Wakihira, Michitaka Katsuta, Masayasu Hino, Kouhei Matsumoto, Yoshio Nakahara, Tosio Sasayama