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3. Patents, net (Details) - USD ($)
Mar. 31, 2020
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Patents $ 211,645 $ 211,645
Accumulated amortization (154,141) (144,977)
Finite-Lived Intangible Assets, Net $ 57,504 $ 66,668