Quarterly report pursuant to Section 13 or 15(d)

Changes in the derivative liability (Details)

v3.21.4
Changes in the derivative liability (Details) - USD ($)
3 Months Ended
Oct. 31, 2021
Jul. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Derivative liability at April 30, 2021 $ 2,495,378 $ 2,812,767
Eliminated upon exercise of warrants (163,141)
Changes in fair value, primarily related to decrease in Company's stock price (118,813) (154,248)
Derivative liability at October 31, 2021 $ 2,376,565 $ 2,495,378