US PATENT SUBCLASS 411 / 416
.~.~ Lobular thread

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}
416.~.~ Lobular thread

DEFINITION

Classification: 411/416

Lobular thread:

(under subclass 411) Subject matter wherein the major

diameter of the ridge varies along the circumference of the ridge.

(1) Note. The major diameter consists of that distance from crest taken along a line transverse to the fastener axis. The variation of the major diameter will generally consist of alternating high and low points in the thread cross section.