US PATENT SUBCLASS 57 / 334
.~.~ 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}
332  DF  .~ False twist device {4}
334.~.~ Friction type {4}
335  DF  .~.~.~> Revolving roll-pair type
336  DF  .~.~.~> Having a frictional belt
337  DF  .~.~.~> Having a frictional disc {1}
341  DF  .~.~.~> Having a frictional tube, or a twisting head therefor, through which yarn passes {2}

DEFINITION

Classification: 57/334

Friction type:

(under subclass 332) Subject matter in which the rotation of the strand material about its axis is caused by a frictional force or forces applied substantially tangentially to the periphery of the strand.

SEE OR SEARCH THIS CLASS, SUBCLASS:

331, for friction-type false twisters combined with drafting means.