Patents by Inventor David William Challen

David William Challen 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).

  • GRADING APPARATUS FOR GRADING A SURFACE
    Publication number: 20100044062
    Abstract: The present invention relates to a grading apparatus (10, 210) comprising an elongate support arm assembly (12, 212) having a mount (16, 216) at one end for attachment to a vehicle (100), and a grading blade (14, 214) attached to the opposing end of the support arm assembly. The grading blade can be positioned outwardly of the vehicle to grade a surface beside the vehicle as the vehicle moves forward.
    Type: Application
    Filed: December 3, 2007
    Publication date: February 25, 2010
    Inventors: David William Challen, Wallace David Challen