US PATENT SUBCLASS 175 / 70
.~.~ Plural distinguishable liquids

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

57  DF  PROCESSES {5}
65  DF  .~ Boring with specific fluid {7}
70.~.~ Plural distinguishable liquids

DEFINITION

Classification: 175/70

(under subclass 65) Processes comprising drilling with two or

more liquids which remain separated in the borehole due to their mutual immiscibility, difference in specific gravities, manner of placement in the borehole, or other characteristics.

SEE OR SEARCH THIS CLASS, SUBCLASS:

11+, in which plural liquids such as kerosene and water may be introduced in boring by directly applying heat to fluidize or comminute.