Patents by Inventor Liu Ching-Liang

Liu Ching-Liang 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).

  • Coil spring exerciser
    Patent number: 4856776
    Abstract: A dyna-bender includes an internal coil spring; an external coil spring, coaxially surrounding the internal coil spring, having an intermediate portion spaced from the internal coil spring at a predetermined distance, and two opposite end portions having diameter-reduced turns for being sleeved tightly on the internal coil spring; and two hollow plastic grips each having an open inner end which is heat pressed to sleeve tightly on one of the end portions of the external coil spring.
    Type: Grant
    Filed: December 31, 1987
    Date of Patent: August 15, 1989
    Inventor: Liu Ching-Liang