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. 19, 2005
Filed:
Dec. 17, 2002
Applicants:
Kwong-onn C. Chan, Edmonton, CA;
Behrooz Movaffagh, Edmonton, CA;
Loren Boisvert, Edmonton, CA;
Inventors:
Assignee:
Vetco Gray Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B017/18 ;
U.S. Cl.
CPC ...
Abstract
A valve assembly connects into a drill string for opening and closing the inner passage within the drill string. The valve member moves between the open and closed positions in response to axial movement of the drill string. The valve member has an upper portion and a lower portion. A valve member and valve sleeve are located within an inner passage. Lifting the drill string causes the upper portion to move upward relative to the lower portion, bringing along with it the valve member, while the valve sleeve remains stationary with the lower portion, opening the valve.