Intangible Assets

6 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

NOTE 7 – INTANGIBLE ASSETS

The components of intangible assets, all of which are finite-lived, were as follows:

	September 30, 2019			March 31, 2019
Patents	$	3,844,092		$	3,820,374
Trademarks		24,098			22,829
Total, at cost		3,868,190			3,843,203
Accumulated Amortization		(3,528,093	)		(3,253,386	)
Total, net	$	340,097		$	589,817

During the three and six-month periods ended September 30, 2019, amortization expense was $137,598 and $274,707, respectively. During the three and six-month periods ended September 30, 2018, amortization expense was $159,448 and $318,915, respectively.