US PATENT SUBCLASS 411 / 12
.~.~.~.~ Coil spring

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

8  DF  WITH MEANS TO INDICATE APPLICATION OF PREDETERMINED STRESS-STRAIN {3}
9  DF  .~ Axially deformable member or portion {1}
10  DF  .~.~ Deformable washer {1}
11  DF  .~.~.~ Resilient {1}
12.~.~.~.~ Coil spring

DEFINITION

Classification: 411/12

Coil spring:

(under subclass 11) Subject matter wherein the resilient member is in the form of a helically wound element which is axially compressed to indicate the attainment of a desired degree of tension, compression, or torque.