US PATENT SUBCLASS 119 / 419
.~.~.~ Utilizing air filtration device

Current as of: June, 1999
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119 /   HD   ANIMAL HUSBANDRY

416  DF  CONFINING OR HOUSING {11}
417  DF  .~ For experimental purposes {3}
418  DF  .~.~ With biologically isolating ventilation means {1}
419.~.~.~ Utilizing air filtration device

DEFINITION

Classification: 119/419

Utilizing air filtration device:

(under subclass 418) Subject matter wherein the ventilation means employs a device through which air or breathing matter passes and is treated to remove biological contaminants.

SEE OR SEARCH CLASS

55, Gas Separation, for appropriate filter related subclasses such as 315+, 341.1+, and 361+.