Patents by Inventor Cornelius Hendricus Van Der Knaap

Cornelius Hendricus Van Der Knaap 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).

  • Apparatus for gripping a downhole tubular
    Publication number: 20090095489
    Abstract: A downhole tubular gripping and suspending apparatus adapted for gripping a downhole tubular and suspending said downhole tubular from said apparatus. The apparatus has a housing (2) and a bottom opening (6) for introducing said top end of said tubular into a reception chamber (5) via said bottom opening (6). External coupler gripping members (20) are mounted on said housing (2) and adapted to grip an exterior of the enlarged diameter part of the coupler Shoulder support members (30) are mounted on said housing (2) and adapted to engage under said shoulder (103) of a tubular top end received in said reception chamber (5).
    Type: Application
    Filed: August 22, 2005
    Publication date: April 16, 2009
    Applicant: ITREC B.V.
    Inventors: Joop Roodenburg, Diederick Bernardus Wijning, Cornelius Hendricus Van Der Knaap