US PATENT SUBCLASS 474 / 188
.~ Including grooves or openings in cylindrical belt-engaging surface (e.g., for escape of air, etc.)

Current as of: June, 1999
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474 /   HD   ENDLESS BELT POWER TRANSMISSION SYSTEMS OR COMPONENTS

166  DF  FRICTION DRIVE PULLEY OR GUIDE ROLL {11}
188.~ Including grooves or openings in cylindrical belt-engaging surface (e.g., for escape of air, etc.) {1}
189  DF  .~.~> Circumferentially extending grooves

DEFINITION

Classification: 474/188

Including grooves or openings in cylindrical belt-engaging surface (e.g., for escape of air, etc.):

(under subclass 166) Subject matter wherein the drive surface is on a generally cylindrical unitary member, and wherein said drive surface has apertures or grooves formed therein and arranged in a pattern extending about the entire periphery of the member. [figure]