Patents by Inventor Michael F. Robertshaw

Michael F. Robertshaw 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: 4132160
    Abstract: The present invention relates to a ventilator assembly for caravans or buildings. A ventilator panel is provided with internal projections any one of which can be engaged by a wiper arm to hold that part of the panel against opening movement. A slidable shaft raises the remainder of the panel so that the orientation of the opening can be selected.
    Type: Grant
    Filed: June 8, 1977
    Date of Patent: January 2, 1979
    Inventor: Michael F. Robertshaw