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:
Nov. 28, 2017
Filed:
Feb. 17, 2012
Applicants:
Julian Davis, Bristol, GB;
Martin Stokes, Gwent, GB;
Inventors:
Julian Davis, Bristol, GB;
Martin Stokes, Gwent, GB;
Assignee:
GE Oil & Gas UK Limited, Nailsea, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 31/06 (2006.01); E21B 33/035 (2006.01); E21B 34/06 (2006.01); E21B 41/00 (2006.01); H01F 7/18 (2006.01); F16K 37/00 (2006.01);
U.S. Cl.
CPC ...
E21B 33/0355 (2013.01); E21B 34/066 (2013.01); E21B 41/0007 (2013.01); F16K 37/0083 (2013.01); H01F 7/1844 (2013.01); G01R 31/06 (2013.01); H01F 2007/1888 (2013.01);
Abstract
A method of testing a solenoid of a directional control valve in a subsea hydrocarbon production system, the solenoid having a coil and an armature for operating the valve and the coil being energized by a drive voltage across it, the method comprises removing or reducing the drive voltage and sensing current through the coil to produce an indication of movement of the armature.