Patents by Inventor Padmasiri Seneviratne

Padmasiri Seneviratne 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).

  • Triple valve blow out preventer
    Publication number: 20060191679
    Abstract: A triple-valve internal blow out preventer having unitary construction is provided, each valve including a tubular assembly having a central passageway with upper and lower seats mounted therein. A ball is rotatably received between the upper and lower seats and includes an external surface and a central opening, wherein the central opening may include an undercut. A protective coating may also be applied to both the external surface and the undercut of the ball to increase the durability of each of the valves.
    Type: Application
    Filed: August 9, 2005
    Publication date: August 31, 2006
    Inventors: Padmasiri Seneviratne, Lawrence Wells, David Mason
  • Internal blow out preventer ball and seat
    Publication number: 20050081918
    Abstract: An internal blow out preventer is provided that includes a ball valve including a tubular assembly having a central passageway with upper and lower seats mounted therein. A ball is rotatably received between the upper and lower seats and includes an external surface and a central opening, wherein the central opening includes an undercut. A protective coating is applied to both the external surface and the undercut of the ball.
    Type: Application
    Filed: October 21, 2004
    Publication date: April 21, 2005
    Inventors: Padmasiri Seneviratne, Lawrence Wells, David Mason