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. 21, 2012
Filed:
Jan. 15, 2009
Applicants:
Huward Paul Fontenot, Jr., Spring, TX (US);
Robert James Costo, Jr., The Woodlands, TX (US);
Richard David Peer, Katy, TX (US);
Inventors:
Huward Paul Fontenot, Jr., Spring, TX (US);
Robert James Costo, Jr., The Woodlands, TX (US);
Richard David Peer, Katy, TX (US);
Assignee:
Smith International, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 34/12 (2006.01);
U.S. Cl.
CPC ...
Abstract
A downhole valve assembly is attached to a drillstring and includes an upper drillstring connection, a lower drillstring connection, and a tubular body comprising a through bore, and further includes a weight activated mechanism configured to close the through bore when the drillstring is lifted.