3. PATENTS

12 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

PATENTS

3. PATENTS 

Patents consist of the following: 

	March 31, 2018			March 31, 2017
Patents	$	211,645		$	211,645
Accumulated amortization		(135,813	)		(126,649	)
	$	75,832		$	84,996

Amortization expense for patents for the years ended March 31, 2018 and 2017 was $9,164 and $9,165, respectively. Future amortization expense on patents is estimated to be approximately $9,000 per year based on the estimated life of the patents. The weighted average remaining life of our patents is approximately 3.2 years.