US PATENT SUBCLASS 277 / 336
.~ For below ground apparatus

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.~ For below ground apparatus {1}
337  DF  .~.~> Longitudinally actuated packer {2}

DEFINITION

Classification: 277/336

For below ground apparatus:

(under subclass 322) Seal for well apparatus wherein the seal's use is on a device intended to function below earth level.

SEE OR SEARCH THIS CLASS, SUBCLASS:

331+, for an inflatable packer-type seal for well apparatus.