Patents by Inventor Yen-Chang Wen

Yen-Chang Wen 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).

  • Punchbag
    Publication number: 20020115538
    Abstract: A punchbag is composed of an inner bag and an outer bag. The two bags can be separated from each other and folded respectively to make easy transportation and storage. This punchbag has an excellent rebound due to dividing the inner bag into a water chamber and an air chamber.
    Type: Application
    Filed: February 16, 2001
    Publication date: August 22, 2002
    Inventor: Yen-Chang Wen