ALEXANDRIA, Va., March 31 -- United States Patent no. 12,590,042, issued on March 31, was assigned to DENKA COMPANY Ltd. (Tokyo).
"Liquid humic acid extract" was invented by Kazuma Honda (Machida, Japan), Taiga Sato (Sagamihara, Japan) and Toshiharu Ichijoh (Hanamaki, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A liquid humic acid extract that does not form precipitates when combined with a liquid fertilizer containing at least one of Mg, Fe, Zn and Mo and having an electric conductivity of 90 ms/cm or more. A liquid humic acid extract containing humic acid that has a mass-average molecular weight of 100 to 1,200, and having a total organic carbon concentration of 15,000 to 25,000 mg/L and a pH of 0...