US PATENT SUBCLASS 411 / 417
.~.~ Circumferentially interrupted 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}
417.~.~ Circumferentially interrupted thread {2}
418  DF  .~.~.~> By longitudinal slot {2}
422  DF  .~.~.~> By transversely extending bore

DEFINITION

Classification: 411/417

Circumferentially interrupted thread:

(under subclass 411) Subject matter wherein the helical ridge has a discontinuity of at least a portion of a depth of a ridge section with the ridge on either side circumferentially thereof being of full depth.

SEE OR SEARCH THIS CLASS, SUBCLASS:

221+, and 271+, for a threaded bolt and nut means for coupling them against rotation relative to one another and wherein the means includes an axially extending recess in the externally threaded element.

437, for an internally threaded fastener element having interrupted thread structure.