(under subclass 258) Method or apparatus wherein a substance which is to be used in or is formed by a chemical process is applied directly to an earth formation to either (a) form a coating on said formation, (b) impregnate the formation, or (c) fill a subterranean cavity within the formation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
57, for treatment of the walls of an underground fluid storage cavity by a chemical composition.
SEE OR SEARCH CLASS
166, Wells,
285+, for methods of cementing, plugging, or consolidating the earth around a well bore, usually under the surface of the ground.
404, Road Structure, Process, or Apparatus,
75+, for processes under that class definition including a step of treating in situ the earth or a roadway. 520, Synthetic Resins or Natural Rubbers, appropriate subclasses, particularly Class 523
130+, for a composition containing a synthetic resin or natural rubber and having utility in sealing fissures or crevices in stone, rock, or other subterranean formations or in consolidating a formation in a well or in cementing a well
