US PATENT SUBCLASS 166 / 74
.~ With below ground screen

Current as of: June, 1999
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166 /   HD   WELLS

67  DF  WITH BELOW AND ABOVE GROUND MODIFICATION {6}
74.~ With below ground screen

DEFINITION

Classification: 166/74

(under subclass 67) Devices comprising a well screen as defined in subclass 227.

SEE OR SEARCH THIS CLASS, SUBCLASS:

51, for wells with screens and means for placing filter material.

56, for wells with screens and pipes outside of the screens for cleaning them or the area around them.

71, for casings with screens and above ground casing sinking means.