US PATENT SUBCLASS 411 / 532
.~ Including release means

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

531  DF  WASHER STRUCTURE {11}
532.~ Including release means

DEFINITION

Classification: 411/532

Including release means:

(under subclass 531) Subject matter wherein means are provided for permitting the element to become effectively disengaged from a fastener with which it is used without having to first remove said fastener.