US PATENT SUBCLASS 226 / 147
.~ With retrograde movement preventer

Current as of: June, 1999
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226 /   HD   ADVANCING MATERIAL OF INDETERMINATE LENGTH

120  DF  BY INTERMITTENT (INTERRUPTED) MATERIAL-MOVER {13}
147.~ With retrograde movement preventer {3}
148  DF  .~.~> Unidirectionally rotating roll
149  DF  .~.~> Positively actuated to grip {1}
151  DF  .~.~> Yieldingly biased

DEFINITION

Classification: 226/147

(under subclass 120) Device provided with means to preclude reverse movement of the material.

(1) Note. The preventer is additional to the material-advancer and must be claimed as means (or equivalent term) which is clearly disclosed as prohibiting reverse movement of the material.