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:
May. 22, 2018
Filed:
Sep. 01, 2014
Applicant:
Drillmec Spa, Gariga di Podenzano, IT;
Inventor:
Angelo Calderoni, Gariga di Podenzano, IT;
Assignee:
DRILLMEC SPA, Gariga Di Podenzano (PC), IT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 21/10 (2006.01); E21B 21/08 (2006.01);
U.S. Cl.
CPC ...
E21B 21/10 (2013.01); E21B 21/08 (2013.01); E21B 21/103 (2013.01); E21B 21/106 (2013.01);
Abstract
A valve assembly is for selectively opening and closing a radial aperture provided on a drilling element for drilling mud circulation. The valve assembly includes a valve body that has an inlet aperture and an outlet aperture, and a duct for putting the apertures in communication with each other, thereby defining a mud path (p). The valve assembly includes at least two shutters arranged in a cascade along the direction of the mud path (p), thus forming at least a double barrier.