Patents by Inventor Takehiro OKUWAKI

Takehiro OKUWAKI 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).

  • External screw member
    Patent number: 10954985
    Abstract: An external screw member includes a head, a shank, a parallel threaded portion, a tapered threaded portion, a screw thread, a convex portion and a screw driving side end face of the convex portion. The convex portion protruding more radially outward than the crest of the screw thread is formed in at least one of the parallel threaded portion and the tapered threaded portion over the tapered threaded portion and the parallel threaded portion. The screw driving side end face of the convex portion is configured to form an inclined plane which gradually rises from a root position of the end face at the side of the crest of the screw thread toward a crest of the convex portion in a direction opposite to a screw driving direction of the screw thread to reach the crest of the convex portion.
    Type: Grant
    Filed: May 20, 2020
    Date of Patent: March 23, 2021
    Assignee: TOPURA CO., LTD.
    Inventors: Takehiro Okuwaki, Takeki Sawanishi, Shigeto Mori, Mayumi Matsuno, Yoshie Sato
  • EXTERNAL SCREW MEMBER
    Publication number: 20200370587
    Abstract: An external screw member includes a head, a shank, a parallel threaded portion, a tapered threaded portion, a screw thread, a convex portion and a screw driving side end face of the convex portion. The convex portion protruding more radially outward than the crest of the screw thread is formed in at least one of the parallel threaded portion and the tapered threaded portion over the tapered threaded portion and the parallel threaded portion. The screw driving side end face of the convex portion is configured to form an inclined plane which gradually rises from a root position of the end face at the side of the crest of the screw thread toward a crest of the convex portion in a direction opposite to a screw driving direction of the screw thread to reach the crest of the convex portion.
    Type: Application
    Filed: May 20, 2020
    Publication date: November 26, 2020
    Inventors: Takehiro OKUWAKI, Kenju SAWANISHI, Shigeto MORI, Mayumi MATSUNO, Yoshie SATO