US PATENT SUBCLASS 411 / 413
.~.~.~ Of different pitch

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

378  DF  EXTERNALLY THREADED FASTENER ELEMENT, E.G., BOLT, SCREW, ETC. {16}
411  DF  .~ Thread or shank structure {7}
412  DF  .~.~ Plural threads on single shank {1}
413.~.~.~ Of different pitch

DEFINITION

Classification: 411/413

Of different pitch:

(under subclass 412) Subject matter wherein the pitch of one of the helical ridges differs from that of another of the helical ridges over at least a portion of its length.

(1) Note. Pitch is defined as the distance between the crests of two adjacent thread or helical ridge convolutions.