The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 2015
Filed:
Jan. 10, 2011
Applicant:
Slawomir Kukielka, Kristiansand, NO;
Inventor:
Slawomir Kukielka, Kristiansand, NO;
Assignee:
National Oilwell Norway AS, Kristiansand S, NO;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 33/06 (2006.01); E21B 21/10 (2006.01);
U.S. Cl.
CPC ...
E21B 21/106 (2013.01);
Abstract
An internal blow out preventer for use in a drill string, comprising a housing having an outer valve closure element and where the outer valve closure element is configured to be moved between an open and a closed position, wherein the outer valve closure element is provided with an inner valve closure element that is configured to be moved between an open and a closed position inside the outer valve closure element.