Patents by Inventor Michael R. Willert

Michael R. Willert 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: 5236322
    Abstract: A concrete pipe making machine having a vibrating core and counter-rotating roller head is used to form a concrete pipe within a form. A concrete pipe reinforcing cage located within the form is held in spaced relation relative thereto with a plurality of cage positioners. Each cage positioner has a moveable blade connected to a piston and cylinder assembly operable to move the blade to a cage holding position and a blade retracted position out of engagement with the cage. The piston and cylinder assembly has a cylinder with a internal chamber having a rectangular cross section. A rectangular piston within the chamber is secured directly to the blade.
    Type: Grant
    Filed: August 23, 1991
    Date of Patent: August 17, 1993
    Assignee: International Pipe Machinery Corporation
    Inventor: Michael R. Willert