Intangible Assets and Liabilities Other Than Goodwill (Tables)

3 Months Ended

Mar. 31, 2021

As of March 31, 2021 and December 31, 2020 the Company had the following amounts related to intangible assets and liabilities other than goodwill:


	March 31, 2021						December 31, 2020
Intangible assets	Cost		Accumulated Amortization		Total		Cost		Accumulated Amortization		Total
Product certifications	$	726,160	$	(491,950)	$	234,210	$	726,159	$	(478,357)	$	247,802
Patents	853,296		(244,810)		608,486		855,014		(220,764)		634,250
Developed technology	240,000		(128,000)		112,000		240,000		(124,000)		116,000
Trademarks	26,896		—		26,896		26,896		—		26,896
In Process R&D	263,936		—		263,936		263,936		—		263,936
Favorable contract asset	384,465		(324,290)		60,175		384,465		(313,030)		71,435

	$	2,494,753	$	(1,189,050)	$	1,305,703	$	2,496,470	$	(1,136,151)	$	1,360,319

Intangible liability
Unfavorable contract liability	$	2,534,818	$	(1,007,153)	$	1,527,665	$	2,534,818	$	(917,767)	$	1,617,051

Aggregate future amortization over the next five years is estimated to be as follows: