Patents by Inventor James Landrith

James Landrith 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).

  • Pilot close vent valve
    Patent number: 11293462
    Abstract: A valve for use in a hydraulic circuit to drive a piston is fluidly connected to a first actuating chamber of the hydraulic piston. The valve is piloted to close when the first chamber is pressurized. The valve vents the fluid in the first actuating chamber when the first chamber is not pressurized. The valve permits several fluid supplies connected to the chamber via check valves to be used to drive the piston. The hydraulic piston and hydraulic circuit may be implemented in a blowout preventer operating in a subsea environment to ensure safe drilling of deepwater wells.
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: April 5, 2022
    Inventors: Travis James Miller, Frank Benjamin Springett, James William Weir, James Landrith
  • Pilot Close Vent Valve
    Publication number: 20200362885
    Abstract: A valve for use in a hydraulic circuit to drive a piston is fluidly connected to a first actuating chamber of the hydraulic piston. The valve is piloted to close when the first chamber is pressurized. The valve vents the fluid in the first actuating chamber when the first chamber is not pressurized. The valve permits several fluid supplies connected to the chamber via check valves to be used to drive the piston. The hydraulic piston and hydraulic circuit may be implemented in a blowout preventer operating in a subsea environment to ensure safe drilling of deepwater wells.
    Type: Application
    Filed: February 8, 2017
    Publication date: November 19, 2020
    Inventors: Travis James Miller, Frank Benjamin Springett, James William Weir, James Landrith
  • Hydraulic circuit for controlling a movable component
    Patent number: 10508663
    Abstract: Hydraulic circuits for controlling a movable component use one or more of a plurality of fluid supplies. Pressurized fluid flowing from one supply is routed toward the component and is not inadvertently vented into another fluid supply, or into an exit port. A backflow path is provided for fluid returning from the hydraulic component when the component is actuated in a reversed direction. The hydraulic circuits can be used, for example, on blowout preventers in a subsea environment.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: December 17, 2019
    Assignee: National Oilwell Varco, L.P.
    Inventors: Richard W. Cowan, Frank Benjamin Springett, James William Weir, Travis James Miller, James Landrith
  • HYDRAULIC CIRCUIT FOR CONTROLLING A MOVABLE COMPONENT
    Publication number: 20190055963
    Abstract: Hydraulic circuits for controlling a movable component use one or more of a plurality of fluid supplies. Pressurized fluid flowing from one supply is routed toward the component and is not inadvertently vented into another fluid supply, or into an exit port. A backflow path is provided for fluid returning from the hydraulic component when the component is actuated in a reversed direction. The hydraulic circuits can be used, for example, on blowout preventers in a subsea environment.
    Type: Application
    Filed: January 27, 2017
    Publication date: February 21, 2019
    Inventors: Richard W. Cowan, Frank Benjamin Springett, James William Weir, Travis James Miller, James Landrith