US PATENT SUBCLASS 411 / 131
.~.~.~ And has specific structure to coact with substructure

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

81  DF  THREADED FASTENER LOCKED TO A DISCREET STRUCTURE (E.G., PLATE, RAIL, WHEEL) {13}
116  DF  .~ Head or nut side face held by discrete member (e.g., side lock) {7}
129  DF  .~.~ Member engages inwardly facing surface of bolt head or nut {2}
131.~.~.~ And has specific structure to coact with substructure

DEFINITION

Classification: 411/131

And has specific structure to coact with substructure:

(under subclass 129) Device wherein the member has means (e.g., a flange, one or more linear segments on its perimeter, a projection, etc.) for engaging the substructure, or a particular part (e.g., an edge, a flange) thereof, or a formation (e.g., a groove, a recess) thereon, in such a manner that any tendency of the member to turn relative to the substructure is either eliminated or reduced.