US PATENT SUBCLASS 411 / 438
.~.~ Coil spring

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

427  DF  INTERNALLY THREADED FASTENER ELEMENT, E.G., NUT, ETC. {5}
436  DF  .~ Thread structure {2}
438.~.~ Coil spring

DEFINITION

Classification: 411/438

Coil spring:

(under subclass 436) Subject matter wherein the ridge is defined by the convolutions of a helical resilient element.

SEE OR SEARCH CLASS

29, Metal Working,

240.5, for devices which assemble wire coil thread inserts by rotation.