Patents by Inventor Richard Dannhauser

Richard Dannhauser 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).

  • Manhole cover
    Patent number: 4973191
    Abstract: A manhole cover including a frame and a lid having an insert plate on its upper surface. The lid is insertable into the frame which is provided in the road surface. Securing screws are provided for detachably securing the insert plate to the base portion of the lid from the underside of the lid. The insert plate is configured as an advertising area.
    Type: Grant
    Filed: January 31, 1990
    Date of Patent: November 27, 1990
    Inventor: Richard Dannhauser