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3. PATENTS (Tables)
12 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of patents

Patents, net consist of the following:

 

   March 31, 2021   March 31, 2020 
Issued patents  $157,442   $157,442 
Accumulated amortization   (154,691)   (154,141)
Issued patents, net of accumulated amortization   2,751    3,301 
Patents pending   54,203    54,203 
Patents, net  $56,954   $57,504