US PATENT SUBCLASS 411 / 187
.~.~.~.~ Having axially directed projection or recess

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}
172  DF  .~ Nut having a portion for attachment to substructure {2}
176  DF  .~.~ Fastener having a deformable portion or deforms substructure (e.g., prong) {3}
184  DF  .~.~.~ Region on inwardly facing surface of bolt head or nut {3}
187.~.~.~.~ Having axially directed projection or recess {1}
188  DF  .~.~.~.~.~> Plural, radially extending, and generally equally spaced

DEFINITION

Classification: 411/187

Having axially directed projection or recess:

(under subclass 184) Device wherein the substructure-confronting surface of the bolt head or the nut includes at least one formation (e.g., a ridge, stud, groove, hollow) which is raised or depressed in a direction more or less normally thereto.