US PATENT SUBCLASS 411 / 408
.~.~ Frictional engagement

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}
402  DF  .~ Head driving structure {4}
408.~.~ Frictional engagement

DEFINITION

Classification: 411/408

Frictional engagement:

(under subclass 402) Subject matter wherein the head driving structure consists purely of frictional resistance between mating surfaces of the head and impelling tool.