Patents Represented by Attorney, Agent or Law Firm Bryan W. White
  • Curved flapper valve
    Patent number: 6772842
    Abstract: A flapper valve having a curved flapper and a seat, the flapper and seat each having complementary undulating and tapered perimeters, with sealing surfaces designed to maintain seal integrity under higher pressure, for a given outer diameter to inner diameter ratio, compared to prior art flapper valves.
    Type: Grant
    Filed: September 5, 2002
    Date of Patent: August 10, 2004
    Assignee: Schlumberger Technology Corporation
    Inventors: Dennis M. Read, Alfred Hernandez, Juan A. Campos