US PATENT SUBCLASS 411 / 553
.~.~.~.~ Similar, opposed ramp surfaces

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

337  DF  HEADED FASTENER ELEMENT WITH NUT, WASHER, SECURING MEANS OR CAP {12}
347  DF  .~ Headed fastener element with securing means and biasing spring {2}
349  DF  .~.~ Securing means rotatable about fastener element or rotatably engageable by tool-rotatable headed fastener element {3}
549  DF  .~.~.~ Outwardly extending projection cooperates with socket member having ramp engagement means {3}
553.~.~.~.~ Similar, opposed ramp surfaces

DEFINITION

Classification: 411/553

Similar, opposed ramp surfaces:

(under subclass 549) Subject matter wherein the ramp surfaces extend in a rectilinear manner on diametrically opposite sides of the headed elongated fastening means.