Research and Development and Patents	9 Months Ended
Jan. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Disclosure - Research and Development and Patents	Research and development expenditures are charged to operations as incurred. The costs of obtaining patents, primarily legal fees, are capitalized and, once obtained, are amortized over the life of the respective patent on the straight-line method. Patent amortization expense for the nine months ended January 31, 2020 and 2019 were $10,232 and $8,994 respectively. Patents relate to products that have been developed and are being marketed by the Company. Patents pending relate to products under development.

Research and Development and Patents

9 Months Ended

Jan. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Disclosure - Research and Development and Patents

Research and development expenditures are charged to operations as incurred. The costs of obtaining patents, primarily legal fees, are capitalized and, once obtained, are amortized over the life of the respective patent on the straight-line method.

Patent amortization expense for the nine months ended January 31, 2020 and 2019 were $10,232 and $8,994 respectively.

Patents relate to products that have been developed and are being marketed by the Company. Patents pending relate to products under development.