Patents by Inventor Feng-Song Tsai

Feng-Song Tsai 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).

  • Publication number: 20070297871
    Abstract: A power tap structure comprises a screw head, a bolt being a rod body extended underneath the screw head, and at least two screw thread units having different cutting surfaces respectively called a cutting thread and a retaining thread. Each of the crew thread units further includes a plurality of thread sections connected by a transition screw thread. The cutting thread has a plurality of indentations distributed along a cutting thread surface thereon, whereby the indentations on the cutting thread will effectively cut fibers of a material the bolt is being inserted. Therefore, the screw will penetrate the material quickly and easily. Further, an additional thread unit with narrower pitch can be formed right below the screw head for enhancing the locking effect of the screw when it is embedded into the material.
    Type: Application
    Filed: June 26, 2006
    Publication date: December 27, 2007
    Inventors: Ying-Kung Lu, Feng-Song Tsai
  • Patent number: 6887023
    Abstract: A screw with protruding sheets on a head portion comprises a thread portion; a screw tail at one end of the thread portion, a slot formed on the screw tail; a plurality of screwing sheets formed at another end of the thread portion; a plurality of recesses formed between the plurality of screwing sheets for removing undesired pieces; a drilling head being formed at front ends of the screwing sheets; the drilling head formed with a plurality of protruding sheets made of soft metal. By screwing the screw by rotating from the slot, the screw will rotate so as to drill a hole and enter into a wood plate. Then the protruding sheets enlarge the hole. The undesired wood pieces are removed from the recesses. When the screw further drills into a metal plate, the protruding sheet will be worn out because the protruding sheet is made of soft metal.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: May 3, 2005
    Inventors: Ying-Kung Lu, Feng-Song Tsai