Patents by Inventor Christopher M. Powell

Christopher M. Powell 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).

  • Dual stereographic net
    Patent number: 4152835
    Abstract: Instruments presently available for stereographic calculations use a single net over which transparent paper is moved. The device of this invention has two nets, one printed on each side of a rotatable disc in a frame and the calculations are made by rotating the nets under transparent paper fixed to the frame.
    Type: Grant
    Filed: October 18, 1977
    Date of Patent: May 8, 1979
    Inventor: Christopher M. Powell
  • Plotting instrument
    Patent number: D254125
    Type: Grant
    Filed: June 28, 1977
    Date of Patent: February 5, 1980
    Inventor: Christopher M. Powell