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. 10, 2012
Filed:
Aug. 14, 2008
Applicant:
Dennis J. Penisson, Raceland, LA (US);
Inventor:
Dennis J. Penisson, Raceland, LA (US);
Assignee:
Wellbore Specialties, LLC, Lockport, LA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 43/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A downhole circulating tool including a sleeve with a cam slot having continuous and symmetrical wishbone patterns through which a cam pin moves. The cam pin moves simultaneously through symmetrical portions of the cam slot to alternate the opening and closing of first and second fluid port openings. A first port opening is operable to communicate fluid to a drill bit when open. A second port opening is operable to communicate fluid directly into the borehole or casing wall of a wellbore when open.