US PATENT SUBCLASS 411 / 391
.~.~ By fluent pressure

Current as of: June, 1999
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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

378  DF  EXTERNALLY THREADED FASTENER ELEMENT, E.G., BOLT, SCREW, ETC. {16}
390  DF  .~ Single element having means facilitating or effecting separation {1}
391.~.~ By fluent pressure

DEFINITION

Classification: 411/391

By fluent pressure:

(under subclass 390) Subject matter wherein the means allowing or producing separation is adapted to operate by the application of a pressurized fluid or flowable substance.