US PATENT SUBCLASS 277 / 342
.~.~.~ Plural stacked rings

Current as of: June, 1999
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277 /   HD   SEAL FOR A JOINT OR JUNCTURE

322  DF  SEAL FOR WELL APPARATUS {8}
336  DF  .~ For below ground apparatus {1}
337  DF  .~.~ Longitudinally actuated packer {2}
342.~.~.~ Plural stacked rings

DEFINITION

Classification: 277/342

Plural stacked rings:

(under subclass 337) Longitudinally actuated packer comprising annular seals arranged axially in series.