Patents by Inventor Liu Yin-Feng

Liu Yin-Feng 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).

  • Variably threaded screw
    Patent number: 8894339
    Abstract: A variably threaded screw has a first end and a second end, the first end of the shaft terminating in a tip and the second end having a widened head thereon. A first helical thread portion is located on the shaft adjacent the widened head. A second helical thread portion is located on the shaft adjacent the tip of the shaft. A third helical thread portion is located on the shaft between the first helical thread portion and the second helical thread portion. The first helical thread portion and the second helical thread portion have right hand thread pitches. The third helical thread portion has a left hand thread pitch. A helical ridge having a right hand thread pitch intersects the third helical thread portion.
    Type: Grant
    Filed: June 19, 2008
    Date of Patent: November 25, 2014
    Assignee: Simpson Strong-Tie Company, Inc.
    Inventor: Liu Yin-Feng
  • Variably Threaded Screw
    Publication number: 20080273939
    Abstract: A variably threaded screw has a first end and a second end, the first end of the shaft terminating in a tip and the second end having a widened head thereon. A first helical thread portion is located on the shaft adjacent the widened head. A second helical thread portion is located on the shaft adjacent the tip of the shaft. A third helical thread portion is located on the shaft between the first helical thread portion and the second helical thread portion. The first helical thread portion and the second helical thread portion have right hand thread pitches. The third helical thread portion has a left hand thread pitch. A helical ridge having a right hand thread pitch intersects the third helical thread portion.
    Type: Application
    Filed: June 19, 2008
    Publication date: November 6, 2008
    Applicant: SIMPSON STRONG-TIE COMPANY, INC.
    Inventor: Liu Yin-Feng
  • Variably threaded screw
    Patent number: 7402016
    Abstract: A variably threaded screw has a first end and a second end, the first end of the shaft terminating in a tip and the second end having a widened head thereon. A first helical thread portion is located on the shaft adjacent the widened head. A second helical thread portion is located on the shaft adjacent the tip of the shaft. A third helical thread portion is located on the shaft between the first helical thread portion and the second helical thread portion. The first helical thread portion and the second helical thread portion have right hand thread pitches. The third helical thread portion has a left hand thread pitch. A helical ridge having a right hand thread pitch intersects the third helical thread portion.
    Type: Grant
    Filed: December 2, 2005
    Date of Patent: July 22, 2008
    Assignee: Simpson Strong-Tie Company, Inc.
    Inventor: Liu Yin-Feng
  • Variably threaded screw
    Publication number: 20060269380
    Abstract: A variably threaded screw has a first end and a second end, the first end of the shaft terminating in a tip and the second end having a widened head thereon. A first helical thread portion is located on the shaft adjacent the widened head. A second helical thread portion is located on the shaft adjacent the tip of the shaft. A third helical thread portion is located on the shaft between the first helical thread portion and the second helical thread portion. The first helical thread portion and the second helical thread portion have right hand thread pitches. The third helical thread portion has a left hand thread pitch. A helical ridge having a right hand thread pitch intersects the third helical thread portion.
    Type: Application
    Filed: December 2, 2005
    Publication date: November 30, 2006
    Inventor: Liu Yin-Feng
  • Screw
    Patent number: D581776
    Type: Grant
    Filed: November 15, 2007
    Date of Patent: December 2, 2008
    Assignee: A-Stainless International Co., Ltd.
    Inventor: Liu Yin-Feng