Patents by Inventor Wei-Chen Chang

Wei-Chen Chang 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).

  • Patent number: 6386215
    Abstract: An umbrella frame has a hollow shaft, an upper runner disposed on the hollow shaft, a lower runner receiving the hollow shaft, the upper runner having a first upper casing and a first lower casing, the lower runner having a second upper casing and a second lower casing, a key-shaped hole formed on the second upper casing, a thread inserted through the key-shaped hole, the thread having a blocking end, a plug inserted in the key-shaped hole, a winding device inserted through the hollow shaft, and the thread connected to the winding device. A plurality of ribs are connected to the first upper casing. A plurality of stretchers are connected to the lower runner.
    Type: Grant
    Filed: January 3, 2001
    Date of Patent: May 14, 2002
    Inventor: Wei-Chen Chang
  • Patent number: 5649607
    Abstract: An escape assembly has two rows of parallel slide frames positioned on an outer wall. A curved slip frame connects to a last slide frame of each row of parallel slide frames. A slide rail connects to each slide frame. Each slide frames has an H-shaped middle frame connecting to two U-shaped side frames. A slide way is formed in the middle frame. A slide passage is formed between two side frames. The middle frame has two positioning plates. Each side frame has spaced retarding blocks therein. The side frame has a notch thereon. One end of the slide rail is fastened on the side frame. The escape device has a transverse rod, two triangular blocks, two wheels, two parallel longitudinal belts, two loops and a transverse belt with a fastening device thereon. Each end of the transverse rod has a wheel abutting a triangular block. Two rings are disposed beneath the transverse rod. Each ring connects to a longitudinal belt. A loop is disposed at an end of each longitudinal belt.
    Type: Grant
    Filed: May 24, 1996
    Date of Patent: July 22, 1997
    Inventors: Wei-Chen Chang, Chih-Hsiang Liu
  • Patent number: D411914
    Type: Grant
    Filed: February 16, 1998
    Date of Patent: July 13, 1999
    Inventor: Wei-Chen Chang