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:
Jul. 15, 2014
Filed:
Aug. 25, 2009
Applicant:
Kristoffer Braekke, Stavanger, NO;
Inventor:
Kristoffer Braekke, Stavanger, NO;
Assignee:
I-Tec AS, , NO;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 34/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention provides a robust, durable and reliable cylindrical valve having closable, radially extending openings for use in cementing, injection, including hydraulic fracturing, and production in wells having high pressures and large pressure differences. The valve may comprise scraping rings in order to remove deposits and the like when it is to be closed after use. Magnets or other suitable means indicates whether the valve is in an open or closed position.