Patents by Inventor Gary Lee DeMarsh

Gary Lee DeMarsh 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).

  • Patent number: 8359963
    Abstract: An expandable linear explosive shape charge positioner for severing tubular members whereby a plurality of arc-shaped charge chambers are positioned along the same plane and adjacent to the interior walls of the tubular members and detonated to sever the tubular members. The invention is placed within a tubular member and includes a remotely extendible framework having remotely detonable linear explosive shape charges enclosed therein. When in the collapsed position, the apparatus passes through constrictions within the tubular members. When extended, the framework is positioned transversely to the axis of the tubular member with the shape charges positioned adjacent the interior walls thereof. Shape charge chambers with angled ends are presented to provide overlap when the device is fully extended to better ensure complete separation of the tubular member at the discontinuities of the shape charges about the plane of severance.
    Type: Grant
    Filed: October 23, 2009
    Date of Patent: January 29, 2013
    Inventors: David Jacob Fannon, Gary Lee DeMarsh
  • Publication number: 20110094407
    Abstract: An expandable linear explosive shape charge positioner apparatus and method for deploying said apparatus for severing tubular members whereby a plurality of arc segment shape charge chambers are positioned along the same plane and adjacent to the interior walls of the tubular members and detonated to thereby severing the tubular members. The apparatus of the invention is adapted to be placed within a tubular member and includes a remotely extendible framework having remotely detonatable linear explosive shape charges enclosed therein. The apparatus is of a size such that when the framework is not extended, the apparatus passes through constrictions contained within the tubular members, and when extended, the framework is positioned transversely to the axis of the tubular member with the shape charges positioned adjacent the interior walls thereof.
    Type: Application
    Filed: October 23, 2009
    Publication date: April 28, 2011
    Inventors: David Jacob Fannon, Gary Lee Demarsh