US PATENT SUBCLASS 405 / 217
.~ In or on frozen media

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

195.1  DF  MARINE STRUCTURE OR FABRICATION THEREOF {11}
217.~ In or on frozen media

DEFINITION

Classification: 405/217

In or on frozen media:

(under subclass 195.1) Method or apparatus wherein the structure is located in an environment of ice, snow, or below-freezing temperature.

SEE OR SEARCH THIS CLASS, SUBCLASS:

130+, for temperature modification or control of an earthen formation.

SEE OR SEARCH CLASS

166, Wells, CROSS-REFERENCE ART COLLECTION 901 for a collection of subject matter relating to permafrost.