US PATENT SUBCLASS 299 / 21
.~ Fluid-pressed element

Current as of: June, 1999
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299 /   HD   MINING OR IN SITU DISINTEGRATION OF HARD MATERIAL

20  DF  EXPANSIBLE BREAKING-DOWN DEVICES {2}
21.~ Fluid-pressed element {1}
22  DF  .~.~> Piston

DEFINITION

Classification: 299/21

(under subclass 20) Apparatus in which one element of the device is expanded relative to another by the application of fluid pressure to the elements.

SEE OR SEARCH CLASS

166, Wells,

187, and the subclasses there noted for a packer or plug expanded by fluid pressure and subclass 212 and the subclasses there noted for an anchor expanded by fluid pressure.