Patents by Inventor William H. Fahrenkrog

William H. Fahrenkrog 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).

  • Concrete pouring and leveling devices and method of using
    Patent number: 5173004
    Abstract: Concrete pouring and leveling devices and method of using them consisting of vertically placed rigid cylindrical tubes or pipes having reusable yokes inserted at their tops to support screed pipes placed horizontally along the predetermined desired elevation of the concrete surface.
    Type: Grant
    Filed: December 9, 1991
    Date of Patent: December 22, 1992
    Inventor: William H. Fahrenkrog