Patents by Inventor Alton J. Graham

Alton J. Graham 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).

  • Skateboard rink and method
    Patent number: 4121821
    Abstract: An amusement rink for skateboarders is formed by providing spaced mounds of earth on a substantially square, flat lot. A continuous riding track is provided which extends about the lot in a generally serpentine manner and passes over the mounds that it encounters as it progresses along its course, thereby providing a circuitous and undulating ride for the skateboarder.
    Type: Grant
    Filed: March 25, 1977
    Date of Patent: October 24, 1978
    Inventor: Alton J. Graham