US PATENT SUBCLASS 411 / 161
.~.~.~.~ Variations comprise generally radially extending ridges or grooves

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}
132  DF  .~ Lock washer-type member located between substructure and bolt head or nut {8}
147  DF  .~.~ Member comprises washer formed as closed loop or apertured plate or as split ring {8}
160  DF  .~.~.~ Closed loop having plural variations in the profile of a contact surface or a peripheral edge thereof {3}
161.~.~.~.~ Variations comprise generally radially extending ridges or grooves

DEFINITION

Classification: 411/161

Variations comprise generally radially extending ridges or grooves:

(under subclass 160) Device wherein the pattern of recurring changes in the figure's dimension in an axial direction is formed by a plurality of projections or recesses which traverse one or both regions from adjacent one periphery of such a region to adjacent the other periphery and, more often than not, along the shortest path (i.e., a radian) therebetween.

(1) Note. Included herein also, for example, are projections or ridges which (a) are slightly askew to a radian or (b) describe a somewhat curved path between the peripheries.