US PATENT SUBCLASS 411 / 491
.~.~ Oval or lobular shank

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

439  DF  IMPACT DRIVEN FASTENER, E.G., NAIL, SPIKE, TACK, ETC. {13}
487  DF  .~ Shank or penetrating end structure {5}
491.~.~ Oval or lobular shank

DEFINITION

Classification: 411/491

Oval or lobular shank:

(under subclass 487) Subject matter wherein the shank portion is formed with a cross section defining a curved surface having maximum and minimum diameters which constitute alternating high and low points on the periphery of the cross section.