US PATENT SUBCLASS 411 / 490
.~.~ Stepped 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}
490.~.~ Stepped shank

DEFINITION

Classification: 411/490

Stepped shank:

(under subclass 487) Subject matter wherein the shank includes plural sections of progressingly decreasing diameters in the direction of the penetrating end of the fastener with each of said sections being of substantially uniform diameter throughout its length.

SEE OR SEARCH THIS CLASS, SUBCLASS:

497, for impact driven fasteners having a stepped end structure.