Patents by Inventor Derrick Docherty

Derrick Docherty 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).

  • Downhole apparatus
    Patent number: 11753902
    Abstract: Downhole apparatus is provided for location in a fluid-filled bore, such as a well bore. The apparatus comprises a tubular body comprising a plurality of cylindrical chambers for containing a compressible substance, and pistons mounted in the chambers. A lock arrangement is provided and has a locking configuration for retaining the pistons in the chambers and an unlocked configuration in which bore fluid pressure may translate the pistons through the chambers.
    Type: Grant
    Filed: February 15, 2019
    Date of Patent: September 12, 2023
    Assignee: Weatherford U.K. Limited
    Inventors: Derrick Docherty, Stephen Reid
  • DOWNHOLE APPARATUS
    Publication number: 20210047899
    Abstract: Downhole apparatus is provided for location in a fluid-filled bore, such as a well bore. The apparatus comprises a tubular body comprising a plurality of cylindrical chambers for containing a compressible substance, and pistons mounted in the chambers. A lock arrangement is provided and has a locking configuration for retaining the pistons in the chambers and an unlocked configuration in which bore fluid pressure may translate the pistons through the chambers.
    Type: Application
    Filed: February 15, 2019
    Publication date: February 18, 2021
    Inventors: Derrick Docherty, Stephen Reid