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:
Dec. 06, 2011
Filed:
May. 07, 2010
Applicants:
Alan Martyn Eddison, York, GB;
Hazel Farquhar, Aberdeen, GB;
Inventors:
Alan Martyn Eddison, York, GB;
Hazel Farquhar, Aberdeen, GB;
Assignee:
Andergauge Limited, Aberdeen, GB;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
E21B 34/08 (2006.01); E21B 41/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A downhole valve comprises a tubular body and a valve member. The valve member is normally closed and in the closed position may prevent or restrict passage of a working fluid through the body. The valve member is movable to an open position, a first working fluid pressure differential being necessary to move the valve member from the closed position and a lower second working fluid pressure differential being necessary to maintain the valve member in the open position.