US PATENT SUBCLASS 454 / 175
.~.~ Having perforated or slotted duct contacting crop

Current as of: June, 1999
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454 /   HD   VENTILATION

173  DF  STORAGE AREA FOR PERISHABLES {2}
174  DF  .~ Harvested crop ventilation {2}
175.~.~ Having perforated or slotted duct contacting crop {4}
176  DF  .~.~.~> Including insertion means
177  DF  .~.~.~> Horizontal and vertical perforated or slotted ducts {1}
179  DF  .~.~.~> Horizontal duct {1}
181  DF  .~.~.~> With air pump

DEFINITION

Classification: 454/175

Having perforated or slotted duct contacting crop:

(under subclass 174) Subject matter comprising a conduit having a series of holes or elongated openings therealong for admitting or exhausting air from the ventilated space, the

conduit being positioned so as to touch the product of the soil associated with the ventilated space.

(1) Note. The conduit is usually placed inside a pile made up of the product of the soil.