US PATENT SUBCLASS 119 / 227
.~.~.~ With biological filter

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

200  DF  AQUATIC ANIMAL CULTURING {5}
215  DF  .~ Fish culturing {12}
226  DF  .~.~ Fish enclosure - recirculating type {1}
227.~.~.~ With biological filter

DEFINITION

Classification: 119/227

With biological filter:

(under subclass 226) Subject matter wherein the recirculated water is treated by a passthrough apparatus in which living organisms are utilized for water treatment.

SEE OR SEARCH THIS CLASS, SUBCLASS:

260, for a biological-type aquarium filter.

SEE OR SEARCH CLASS

210, Liquid Purification or Separation,

601+, for water treatment by a living organism.