3. PATENTS, NET

12 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

PATENTS, NET

3. PATENTS, NET

Patents, net consist of the following:

	March 31, 2021			March 31, 2020
Issued patents	$	157,442		$	157,442
Accumulated amortization		(154,691	)		(154,141	)
Issued patents, net of accumulated amortization		2,751			3,301
Patents pending		54,203			54,203
Patents, net	$	56,954		$	57,504

Amortization expense for our capitalized issued patents for each of the fiscal years ended March 31, 2021 and 2020 was $550 and $9,164, respectively. As several patents expired during the fiscal year ended March 31, 2020 and only one capitalized patent remains to be amortized, future amortization expense on patents is estimated to be approximately $550 per year based on the estimated life of the patent. The weighted average remaining life of our remaining capitalized patent is approximately 5 years.