• Filing Date: 2019-07-11
  • Form Type: 10-K
  • Description: Annual report
v3.19.2
Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
Apr. 30, 2019
Apr. 30, 2018
Finite-Lived Intangible Assets, Gross $ 642,404 $ 632,850
Finite-Lived Intangible Assets, Accumulated Amortization (417,609) (411,788)
Finite-Lived Intangible Assets, Net 224,795 221,062
Patents [Member]    
Finite-Lived Intangible Assets, Gross 461,637 461,637
Finite-Lived Intangible Assets, Accumulated Amortization (417,609) (411,788)
Finite-Lived Intangible Assets, Net 44,028 49,849
Trademarks and Trade Names [Member]    
Finite-Lived Intangible Assets, Gross 175,100 165,462
Finite-Lived Intangible Assets, Accumulated Amortization 0 0
Finite-Lived Intangible Assets, Net 175,100 165,462
Other assets [Member]    
Finite-Lived Intangible Assets, Gross 5,667 5,751
Finite-Lived Intangible Assets, Accumulated Amortization 0 0
Finite-Lived Intangible Assets, Net $ 5,667 $ 5,751