Patents by Inventor Mark D. Hirsch

Mark D. Hirsch 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).

  • Surfboard and method of making same
    Patent number: 4798549
    Abstract: A surfboard body is built around a hollow stringer which is used for the injection of a lightweight foam into a mold and for providing the support for the lightweight board. One embodiment includes a hard lightweight shell covering the body. Another embodiment includes an air bag built around a stringer.
    Type: Grant
    Filed: June 8, 1987
    Date of Patent: January 17, 1989
    Inventor: Mark D. Hirsch