Patents by Inventor Chyi hong Chen

Chyi hong Chen 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).

  • Open end wrench
    Patent number: 6389933
    Abstract: An open end wrench having a head comprises a first arm comprising a first, second, and third projections each having a first interior surface at one side and a second interior surface at the other side; and an opposite second arm comprising a first, second, and third flats. A first distance between the first flat and the first interior surface of the first projection is smaller than a second distance between the second flat and the first interior surface of the second projection, a third distance between the third flat and the first interior surface of the third projection is larger than the second distance between the second flat and the first interior surface of the second projection, and an angle &thgr; is formed between one side of a held fastener and the second interior surface of one of the first, second, and third projections.
    Type: Grant
    Filed: March 8, 2001
    Date of Patent: May 21, 2002
    Inventor: Chyi hong Chen