US PATENT SUBCLASS 411 / 476
.~.~ Having frangible portion

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}
457  DF  .~ Multiple prong, e.g., nailing plate, staple, etc. {8}
476.~.~ Having frangible portion

DEFINITION

Classification: 411/476

Having frangible portion:

(under subclass 457) Subject matter wherein the fastener includes a portion which is specially adapted to fracture during driving thereof or which fractures in order to permit removal of the fastener from the material in which it has been driven.