US PATENT SUBCLASS 111 / 179
.~.~.~.~ Air pressure differential drum

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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.~.~.~.~ Air pressure differential drum {3}
180  DF  .~.~.~.~.~> Vacuum blocker rotates
181  DF  .~.~.~.~.~> Excess material remover
182  DF  .~.~.~.~.~> Protrusions on drum pheriphery

DEFINITION

Classification: 111/179

Air pressure differential drum:

(under subclass 178) Apparatus wherein the rotating dispensing element is a hollow cylinder and wherein the charge of material is held on the surface of the drum by an air pressure differential caused by (a) the creation of a subatmospheric pressure within the hollow interior of the drum and expressed through holes in the drum surface or (b) by a superatmospheric pressure which traps material against the surface of the drum.

SEE OR SEARCH CLASS

221, Article Dispensing,

211, for suction-type discharge assistants, per se.