(under the class definition) Devices comprising an explosive means or a means capable of generating gas, the means in each case being located in the well below ground level.
(1) Note. The "gas generating means" may be a closed container containing compressed gas which is to be released.
SEE OR SEARCH THIS CLASS, SUBCLASS:
55, for explosive or gas generating devices for perforating, weakening, bending or separating a well pipe at any unprepared point other than devices for firing a bullet or exploding a shaped charge which inherently cause penetration of the formation for which see Class 175, subclasses 2+.
57+, for heating means which may cause generation of gas in the formation or well.
162+, for receptacle in which gas (e.g., air) originally not
under pressure may be trapped by fluid rushing in, the gas thus being compressed and escaping. 299, and subclasses there noted for processes involving an explosion in the well.
309, for processes involving producing foam or gas in a well by a foaming or gas producing material.
SEE OR SEARCH CLASS
60, Power Plants,
632+, for one shot explosion actuated expansible chamber type motors.
102, Ammunition and Explosives,
301+, for well torpedoes for use in a well to break up a formation, clean a bore, etc., and for a well torpedo combined with a plug which acts as a tamping means. Class 166, subclass 63, however, take an explosive surrounded by material to form a plug when the explosion occurs.
175, Boring or Penetrating the Earth,
2+, for subject matter relating to a device for firing a bullet or exploding a shaped charge in an inaccessible bore to penetrate the earth formation or perforate or cut a casing or other wall member in the bore and inherently penetrate the formation.
