Patents by Inventor Alistair Bertrum Clark

Alistair Bertrum Clark 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 tool
    Patent number: 6659173
    Abstract: A tubing shoe (30) comprising: a body (32) for mounting on the end of a tubing string; and reaming members (36) extending longitudinally and helically around the body, the reaming members providing substantially complete circumferential coverage of the body whereby, in use, when the tubing shoe is advanced axially into a bore, the reaming members (36) provide reaming around the shoe circumference. A rotatable torque reducing sleeve or centraliser (38) may also be mounted on the body, rearwardly of the reaming members.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: December 9, 2003
    Assignee: Downhole Products PLC
    Inventors: Ian Alastair Kirk, William Barron, Alistair Bertrum Clark
  • Downhole tool
    Publication number: 20020096368
    Abstract: A tubing shoe (30) comprising: a body (32) for mounting on the end of a tubing string; and reaming members (36) extending longitudinally and helically around the body, the reaming members providing substantially complete circumferential coverage of the body whereby, in use, when the tubing shoe is advanced axially into a bore, the reaming members (36) provide reaming around the shoe circumference. A rotatable torque reducing sleeve or centraliser (38) may also be mounted on the body, rearwardly of the reaming members.
    Type: Application
    Filed: March 19, 2002
    Publication date: July 25, 2002
    Applicant: Downhole Products PLC
    Inventors: Ian A. Kirk, William Barron, Alistair Bertrum Clark
  • Downhole tool
    Patent number: 6401820
    Abstract: A tubing shoe (30) comprising: a body (32) for mounting on the end of a tubing string; and reaming members (36) extending longitudinally and helically around the body, the reaming members providing substantially complete circumferential coverage of the body whereby, in use, when the tubing shoe is advanced axially into a bore, the reaming members (36) provide reaming around the shoe circumference. A rotatable torque reducing sleeve or centraliser (38) may also be mounted on the body, rearwardly of the reaming members.
    Type: Grant
    Filed: December 29, 1999
    Date of Patent: June 11, 2002
    Assignee: Downhole Products PLC
    Inventors: Ian Alastair Kirk, William Barron, Alistair Bertrum Clark