US PATENT SUBCLASS 47 / 62 R
.~ Nutrient recirculation system (e.g., hydroponic system)

Current as of: June, 1999
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47 /   HD   PLANT HUSBANDRY

59  DF  WATER CULTURE {3}
62 R.~ Nutrient recirculation system (e.g., hydroponic system) {4}
62 A  DF  .~.~> Aeroponics
62 C  DF  .~.~> Channel
62 E  DF  .~.~> Ebb and Flow systems
62 N  DF  .~.~> Nutrient solution

Unofficial Alpha Subclasses: R A C E N

DEFINITION

Classification: 47/62

(under subclass 59) Apparatus wherein nutrient is automatically supplied to seeds, seedlings or plants at intervals or continuously to revitalize or refresh.