Patents by Inventor David S. R. Campbell

David S. R. Campbell 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).

  • Seismic surveying
    Patent number: 5260911
    Abstract: A method of seismic surveying uses seismic waveguides in the earth. Seismic energy is transmitted from outside the waveguide and detected within the waveguide or vice-versa. Coupling of energy between the outside and the inside of the waveguide is effected by energy leakage at coupling sites where the waveguide departs from planarity. The method analyzes seismic signals to determine the position and nature of coupling sites and the propagation characteristics of the waveguide.
    Type: Grant
    Filed: May 28, 1991
    Date of Patent: November 9, 1993
    Inventors: Iain M. Mason, Geoffrey M. Jackson, Delman Lee, David S. R. Campbell, Charles C. Mosher