US PATENT SUBCLASS 411 / 547
.~.~ Of folded sheet material

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

531  DF  WASHER STRUCTURE {11}
546  DF  .~ Spacer {1}
547.~.~ Of folded sheet material

DEFINITION

Classification: 411/547

Of folded sheet material:

(under subclass 546) Subject matter wherein the element is formed of initially thin flat stock material, which is rolled or otherwise shaped into a generally cylindrical configuration having an axially directed opening therethrough.