Patents by Inventor John P. Fromberg

John P. Fromberg 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: 4711461
    Abstract: A trailer hitch is disclosed for providing coupling about three independent axes between a towing vehicle and a trailer. The hitch includes a first U-shaped yoke member having a base plate adapted for attachment to the towing vehicle and having a pair of spaced-apart arms receiving and supporting a first hinge pin extending along a horizontal, transverse axis. A second U-shaped yoke member having a pair of spaced-apart arms supports a second hinge pin about a vertical axis. The first and second U-shaped yoke members are intercoupled by first and second hollow cylindrical sections joined together in the form of a cross, the first hollow cylindrical section being supported upon the first hinge pin and the second cylindrical section being supported upon the second hinge pin to form a universal coupling.
    Type: Grant
    Filed: April 17, 1986
    Date of Patent: December 8, 1987
    Assignee: Positive Connections, Inc.
    Inventor: John P. Fromberg