Patents by Inventor Earl M. Thompson

Earl M. Thompson 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).

  • Knockdown sign post assembly
    Patent number: 4156332
    Abstract: This invention consists of a knockdown sign post assembly which provides the user with a sign post that can easily be erected and taken down in a quick and efficient manner. The foundation or base of the sign post is readily placed into the ground to which the post for the sign attachment is affixed. Disassembly consists of disengaging the post from the foundation and then removing the foundation from the ground.
    Type: Grant
    Filed: August 29, 1977
    Date of Patent: May 29, 1979
    Inventor: Earl M. Thompson