US PATENT SUBCLASS 411 / 156
.~.~.~.~ Arched configuration circumscribes aperture

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}
155  DF  .~.~.~ Apertured plate having arched sectional configuration (e.g., concavo convex) {1}
156.~.~.~.~ Arched configuration circumscribes aperture

DEFINITION

Classification: 411/156

Arched configuration circumscribes aperture:

(under subclass 155) Device wherein the figure is annular in nature, and further wherein the sectional curvature is displayed twice by a section which contains the principal axis of the figure (i.e., the material on one side of the central opening presents, in section, a mirror image of the material on the other side of the opening).