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INTANGIBLE ASSETS, NET (Details) - Intangible assets, net - USD ($)
May 31, 2022
May 31, 2021
Intangible Assets Net Abstract    
Licenses $ 182,000
Patents 189,000 240,000
Less accumulated amortization-licenses (107,000)
Less accumulated amortization-patents (19,000) (20,000)
Intangible asssets, net $ 169,516 $ 294,830