US PATENT SUBCLASS 166 / 77.53
.~.~ Upper and lower slips

Current as of: June, 1999
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166 /   HD   WELLS

75.11  DF  ABOVE GROUND APPARATUS {25}
77.51  DF  .~ With means facilitating connecting or disconnecting supported tubing or rod sections {2}
77.53.~.~ Upper and lower slips

DEFINITION

Classification: 166/77.53

Upper and lower slips:

(under subclass 77.51) Device for connecting sections including wedge-shaped members, usually with a serrated face, located near the pipe or bar at the top and bottom.