US PATENT SUBCLASS 175 / 16
.~ Electrically produced heat

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

11  DF  BORING BY DIRECTLY APPLYING HEAT TO FLUIDIZE OR COMMINUTE {5}
16.~ Electrically produced heat

DEFINITION

Classification: 175/16

(under subclass 11) Subject matter in which the heat is generated by an electric current either (1) within, or (2) in close proximity to the mineral body being worked.

SEE OR SEARCH CLASS

166, Wells,

60, for electrical well heaters.

219, Electric Heating,

68+, for electrical cutting or disintegrating of metal, subclass 221 for tools and instruments, and subclasses 277+ for oil well heaters.