Patents by Inventor Robert D. Zerkel

Robert D. Zerkel 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).

  • Patent number: 6341795
    Abstract: A trailer hitch coupling device for altering the angle of the tongue of the trailer hitch with respect to the vehicle. The trailer hitch coupling device includes a rod. The rod is elongate and has a first end and a second end. The rod has a front side, a back side and a pair of lateral sides. The rod is generally hollow and has a plurality of pairs of opposed holes therein. The holes extend through the lateral sides. The front side of the rod has an elongate slot therein. A bar is integrally coupled to and extends away from the back side of the rod. The rod has a free end having a bore extending therein such that the bar is substantially hollow. The bar has a peripheral side wall having a plurality of pairs of opposed apertures therein. The bore is adapted for receiving the tongue portion of a trailer hitch. A ball engaging member for engaging a ball hitch is movably positioned in the rod and extending outwardly through the slot.
    Type: Grant
    Filed: September 1, 2000
    Date of Patent: January 29, 2002
    Inventor: Robert D. Zerkel