The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 15, 1994
Filed:
Jan. 30, 1991
Kozo Shirato, Ohmiya, JP;
Erma Incorporation, , JP;
Abstract
The present invention controls the concentrations of oxygen and carbonate gases in a hydroponic solution in a growing pool, by independently connecting online to a growing pool a hydroponic-solution feeder in the structure such that a plurality of semipermeable-membrane tubes to circulate liquid fertilizer (or water) is placed and arranged in a tank to circulate water (or liquid fertilizer), and a controller of dissolved gas concentration in the structure such that a hydroponic-solution conduit and a gas conduit are formed separately by arranging in the tank a separating membrane to pass only gas and prevent the permeation of liquid, and circulating oxygen and/or carbonate gas in the gas conduit of the controller of dissolved gas concentration, along with the circulation of the hydroponic solution in the growing pool through the hydroponic-solution conduit while appropriately controlling the concentration of liquid fertilizer in the hydroponic solution by means of the hydroponic-solution feeder, whereby the dissolved gas in the hydroponic solution is substituted with oxygen and/or carbonate gas.