Patents by Inventor Philip M. Rolla

Philip M. Rolla 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).

  • Marine tractor surface drive system
    Patent number: 5439403
    Abstract: A marine tractor surface drive propulsion system is provided with a housing construction that can be retrofit to existing boat hulls and does not require a dedicated hull, with a parallel countershaft transmission that provides the efficiencies of a tractor surface drive and where a portion of the transmission housing extends over and protectively shields the,surface drive propeller of the drive system.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: August 8, 1995
    Inventor: Philip M. Rolla