Patents by Inventor Mark D. Spencer

Mark D. Spencer 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).

  • Hay bale cart
    Patent number: 6364596
    Abstract: A hand cart adapted to lift and transport a single bale of hay or straw is disclosed. The cart is fabricated from metal stock pieces which are welded to form a rigid frame. The frame is designed with spaced apart wheels which will allow the cart to straddle the bale. Plural prong members impale and secure the bale for lifting and transporting.
    Type: Grant
    Filed: January 18, 2000
    Date of Patent: April 2, 2002
    Inventors: Mark D. Spencer, Jeanne M. Spencer