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:
Jan. 26, 1999
Filed:
Feb. 01, 1996
Drummond Wilkinson Whiteford, Milltimber, GB;
Petroleum Engineering Services Limited, Dyce, GB;
Abstract
A subsurface safety valve includes a one piece pressure housing having a flow passage provided therethrough and a recess formed in a side wall of the flow passage. A flapper member having first and second, respectively open and closed positions, is mounted to the housing in the recess. A control mechanism controls movement of the flapper member between its first and second positions. The control mechanism may include at least one piston substantially longitudinally aligned with flow passage wall, the at least one piston being positioned in longitudinal relation to a portion of a surface of the wall, the surface of the wall being provided with a longitudinal groove and the at least one piston being provided with a protrusion which is received within the longitudinal groove.