US PATENT SUBCLASS 405 / 131
.~ Heating

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


405 /   HD   HYDRAULIC AND EARTH ENGINEERING

130  DF  TEMPERATURE MODIFICATION OR CONTROL OF EARTHEN FORMATION {1}
131.~ Heating

DEFINITION

Classification: 405/131

Heating:

(under subclass 130) Method or apparatus wherein the temperature of an earth formation is elevated.

SEE OR SEARCH CLASS

175, Boring or Penetrating the Earth,

11+, for processes or apparatus for boring or penetrating the earth by directly applying heat to fluidize or comminute.