PATENTS (Tables)

9 Months Ended

Sep. 30, 2021

Patents

The gross carrying amounts and accumulated amortization related to acquired intangible assets as of September, 2021 and December 31, 2020 were as follows

The include patents with estimated remaining economic useful lives ranging from 1.75 to 12 years. For all periods presented, all of the Company’s patents were subject to amortization. The gross carrying amounts and accumulated amortization related to acquired intangible assets as of September, 2021 and December 31, 2020 were as follows

	September 30, 2021			December 31, 2020
Gross carrying amount – patents	$	7,934,000		$	7,848,000
Accumulated amortization – patents		(6,490,000	)		(6,270,000	)
Patents, net	$	1,444,000		$	1,578,000

Future amortization of intangible assets, net is as follows:

Amortization expense for the three months ended September 30, 2021 and 2020 was $74,000 and $72,000, respectively. Amortization expense for the nine months ended September 30, 2021 and 2020 was $221,000 and $216,000, respectively. Future amortization of intangible assets, net is as follows:

Twelve Months Ended September 30,
	2022	$	297,000
	2023		297,000
	2024		87,000
	2025		87,000
	2026 and thereafter		676,000
	Total	$	1,444,000