US PATENT SUBCLASS 411 / 481
.~ Head having central recess

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}
481.~ Head having central recess

DEFINITION

Classification: 411/481

Head having central recess:

(under subclass 439) Subject matter wherein the impact receiving surface includes a cavity aligned with the fastener axis.

(1) Note. The cavity may serve a number of functions, e.g.,

a nail set, etc.