Patents and Trademarks

9 Months Ended

Dec. 31, 2016

(5) Patents and Trademarks

Patents owned by the Company had a gross carrying amount of $1,145,890 and $1,166,374, accumulated amortization of $932,564 and $916,960, and a net carrying amount of $213,326 and $249,414, at December 31, 2016 and March 31, 2016, respectively. Trademarks owned by the Company had a gross carrying amount of $175,841 and $175,841, accumulated amortization of $80,885 and $77,514, and a net carrying value of $94,955 and $98,327 at December 31, 2016 and March 31, 2016, respectively. Patents and trademarks are amortized on a straight-line basis over the estimated useful life of the asset. The weighted-average period of amortization is 8 years for patents, and 40 years for trademarks.

Estimated future amortization of these intangible assets by calendar year is as follows:


	Patents		Trademarks
2017	$	20,926	$	4,496
2018		18,579		4,496
2019		12,316		4,496
2020		8,226		4,496
2021		8,226		4,496
Thereafter		145,053		72,475
	$	213,326	$	94,955