US PATENT SUBCLASS 111 / 180
.~.~.~.~.~ Vacuum blocker rotates

Current as of: June, 1999
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111 /   HD   PLANTING

14  DF  DRILLING {12}
170  DF  .~ Having depositor feature {5}
177  DF  .~.~ Rotating dispensing element {2}
178  DF  .~.~.~ Roll or drum {1}
179  DF  .~.~.~.~ Air pressure differential drum {3}
180.~.~.~.~.~ Vacuum blocker rotates

DEFINITION

Classification: 111/180

Vacuum blocker rotates:

(under subclass 179) Apparatus including a member which turns, spins, or revolves about an axis and rolls along the interior of the drum's surface to selectively cover the holes in the drum's surface thereby cutting off the relative vacuum so as to allow the charge of material to be released from the drum.