Patents by Inventor Alexander Muehlstaedter

Alexander Muehlstaedter 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).

  • Method and apparatus for making manholes
    Patent number: 5192160
    Abstract: A method of making manholes and trenches in which the lateral edges of the manhole or trench are cut in a stepped manner. The apparatus for performing the procedure includes a trailer which is provided with a steerable drive wheel and carries a hydraulic pump motor unit adapted to operate a hydraulic motor driven circular saw and a hydraulically operated hammer both mounted on the trailer.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: March 9, 1993
    Inventor: Alexander Muehlstaedter