US PATENT SUBCLASS 57 / 331
.~.~.~ Friction type

Current as of: June, 1999
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57 /   HD   TEXTILES: SPINNING, TWISTING, AND TWINING

1 R  DF  APPARATUS AND PROCESSES {45}
315  DF  .~ With drafting {5}
328  DF  .~.~ False twist type {3}
331.~.~.~ Friction type

DEFINITION

Classification: 57/331

Friction type:

(under subclass 328) Subject matter having means wherein the false twist and the resultant rotation of the strand material about its axis is effected by a frictional force or forces applied substantially tangentially to the periphery of the strand.

SEE OR SEARCH THIS CLASS, SUBCLASS:

334+, for friction-type false twist devices not combined with drafting means.