Patents by Inventor Chao-Hsin (Michael) Yu

Chao-Hsin (Michael) Yu 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).

  • Self-counter-sinking screw with cutting receiving pockets
    Patent number: 5683217
    Abstract: A self-countersinking screw including an inverted-conical head portion formed at a top with a cavity adapted to receive a tip of a screwdriver and having a conical bottom, said conical bottom having a plurality of triangular recesses each having a lateral side extending inwardly to form a sharp edge and a space for receiving chips, a threaded portion, and a tapered portion having a large diameter connected with the head portion and a small diameter connected with the threaded portion, whereby the sharp edge will make a countersink on a workpiece when the countersunk head screw is turned therein.
    Type: Grant
    Filed: March 27, 1996
    Date of Patent: November 4, 1997
    Inventors: Uli Walther, Chao-Hsin (Michael) Yu
  • Self-countersinking screw with cutting receiving pockets
    Patent number: RE36741
    Abstract: A self-countersinking screw including an inverted-conical head portion formed at a top with a cavity adapted to receive a tip of a screwdriver and having a conical bottom, said conical bottom having a plurality of triangular recesses each having a lateral side extending inwardly to form a sharp edge and a space for receiving chips, a threaded portion, and a tapered portion having a large diameter connected with the head portion and a small diameter connected with the threaded portion, whereby the sharp edge will make a countersink on a workpiece when the countersunk head screw is turned therein.
    Type: Grant
    Filed: October 23, 1998
    Date of Patent: June 20, 2000
    Inventors: Uli Walther, Chao-Hsin (Michael) Yu