US PATENT SUBCLASS 411 / 13
.~ Color indicator

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}
13.~ Color indicator

DEFINITION

Classification: 411/13

Color indicator:

(under subclass 8) Subject matter wherein the self-contained part carries a distinct color producing a visual indication of the measuring attainment or loss of a desired degree of tension, compression, or torque in the device.