Acquisition of patents (Tables)

12 Months Ended

May 31, 2018

Intangible Assets Activity

The following presents intangible assets activity:

	May 31, 2018			May 31, 2017
Gross carrying amounts	$	3,500,000		$	3,500,000
Accumulated amortization		(1,968,846	)		(1,618,770	)
Total amortizable intangible assets, net		1,531,154			1,881,230
Patents currently not amortized		35,989			35,989
Carrying value of intangibles, net	$	1,567,143		$	1,917,219