Patents Assigned to Coupler Development Limited
  • Method and apparatus for adding a tubular to drill string with diverter
    Patent number: 7726418
    Abstract: Apparatus and a method for adding and removing tubulars whilst containing the pressure within a drill string and/or maintaining circulation of drilling fluid down a drill string using a diverter sub which is able to open up to mud flow from a side mud port and close off the flow of mud from above the drill string with or without continuous rotation of the drill string.
    Type: Grant
    Filed: August 16, 2004
    Date of Patent: June 1, 2010
    Assignee: Coupler Development Limited
    Inventor: Laurence John Ayling