Wells

SECTION I - CLASS DEFINITION

This class relates to processes or means not otherwise classified comprising (1) shafts or deep borings in the earth, commonly known as wells, for the extraction of fluids from the earth, (2) shafts or deep borings in the earth for inserting a fluid into the interstices of a porous earth formation, usually to enable withdrawal of fluid from a producing output well, (3) apparatus peculiarly adapted for treating a well or for use in or with a well, or (4) processes of using, making, or treating a well.

This class takes combinations of elements or process steps relating to wells and going beyond the scope of subcombinations, such as measuring or testing means or pumps, classifiable, per se, in other classes. The class also takes subcombinations, such as packers or expanding anchors, peculiar to wells. However, the class does not take various intermediate combinations, such as devices performing only a measuring or testing function or a pumping function, which may include subcombinations, such as packers or expanding anchors, as minor perfecting features.