Subsurface well safety valve and control system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 28, 1986
Grant Date -
N/A
app pub date -
Mar 2, 1984
filing date -
Mar 2, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Subsurface safety valve assembly (16) for oil wells comprising a valve element (57) and a temperature responsive operator comprising multiple coil springs (69, 70), made of shape memory material, operable in opposing directions for opening and closing the valve element and a ratchet locking mechanism comprising wickers (79) for locking the valve in its open position after removal of the heating which causes shape memory effect movement to such position.
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Cited Art Landscape
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