Patents by Inventor Richard Alfred G. Fleming

Richard Alfred G. Fleming 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).

  • Portable low frequency projector
    Patent number: 7355926
    Abstract: A portable low frequency underwater acoustic projector having two circular diaphragms separated by a spacer ring with a pair of coils and oscillating masses being located in pipes connected to central opening in two diaphragms, the coils driving these masses in opposite directions. Central openings in each diaphragm have an associated pipe extending outward from the interior of the projector, the pipe having closed outer ends. The interior of the projector being gas filled to provide pressure compensation.
    Type: Grant
    Filed: December 5, 2005
    Date of Patent: April 8, 2008
    Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of National Defence
    Inventors: Richard J. Religa, Richard Alfred G. Fleming, George K. Schattschneider
  • Flared wave-guide projector
    Patent number: 6567342
    Abstract: An underwater acoustic projector comprising a pair of spaced apart end walls with an acoustic driver positioned between the end walls, the driver having smaller cross-sectional dimensions than the end walls. Each end wall close one end of flared open ended pipe waveguides and is mechanically coupled to one end of a piezoelectric acoustic driver. The flared pipe waveguides extend outward from the driver and have a larger diameter at their open ends than at the end walls.
    Type: Grant
    Filed: June 17, 2002
    Date of Patent: May 20, 2003
    Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of National Defence
    Inventors: Christopher John A. Purcell, Richard Alfred G. Fleming