Patents by Inventor Stephen Gregory Pierce

Stephen Gregory Pierce 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).

  • Subsea Intervention Plug Pulling Device
    Publication number: 20150136406
    Abstract: A plug pulling device includes an elongated housing comprising a production tree connection interface, a shifting tool disposed within and along a substantial length the housing and comprising a distal end configured to couple to a tubing plug, and a seal disposed within the housing and formed around a portion of the shifting tool. The seal isolates a first portion of the housing from a second portion of the housing. The second portion of the housing is adjacent to the production tree connection interface. The shifting tool is configured to move partially in and out of the first portion of the housing when there is a pressure differential between the first portion of the housing and an environment external to the first portion of the housing.
    Type: Application
    Filed: November 18, 2013
    Publication date: May 21, 2015
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Mauricio Baez, Raymond A. Stawaisz, John Lloyd Busby, Brian Saucier, Stephen Gregory Pierce, Walter Warren Weaver