US PATENT SUBCLASS 166 / 292
.~.~ Using specific materials

Current as of: June, 1999
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166 /   HD   WELLS

244.1  DF  PROCESSES {39}
285  DF  .~ Cementing, plugging or consolidating {7}
292.~.~ Using specific materials {2}
293  DF  .~.~.~> Cement or consolidating material contains inorganic water settable and organic ingredients
294  DF  .~.~.~> Cement or consolidating material is organic or has organic ingredient {1}

DEFINITION

Classification: 166/292

(under subclass 285) A process using a specifically claimed material in at least one of the steps of the process.

(1) Note. The mere naming in a claim of Portland cement, hydraulic cement or water is not sufficient to cause classification of a patent in this subclass.

SEE OR SEARCH CLASS

106, Compositions: Coating or Plastic, appropriate subclasses for compositions useful in well cementing, plugging or consolidating.

175, Boring or Penetrating the Earth,

64, and 65+, especially subclass 72, for drilling while circulating fluid which may form a mud sheath or plug the formation. See Lines With Other Classes and Within This Class in the class definition of Class 166 for the line between Class 166 and Class 175.

405, Hydraulic and Earth Engineering, 263+, for processes of applying a chemical substance to an earth formation not involving wells.

507, Earth Boring, Well Treating, and Oil Field Chemistry,

100+, for compositions to carry off cutting during drilling and broadly claimed processes of using said compositions or compounds.