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Patents and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2022

Patents and Other Intangible Assets

Schedule of Patents and other intangible assets

Patents and other intangible assets are summarized as follows:

​

​	​	​	​	​	​	​	​
​	​	March 31,		​	December 31,		​
(in thousands)		2022			2021
Patents	​	​	​	​	​	​	​
Patents pending	​	$	473	​	$	439	​
Issued patents	​		577	​		577	​
​	​		1,050	​		1,016	​
Trademarks	​		​	​		​	​
Trademarks pending	​		1	​		3	​
Registered trademarks	​		95	​		94	​
​	​		96	​		97	​
Other	​		8	​		8	​
​	​		1,154	​		1,121	​
Accumulated amortization	​		(352)	​		(322)	​
​	​	$	802	​	$	799	​

​

Schedule of future amortization expense

Future amortization expense associated with issued patents and registered trademarks as of March 31, 2022 is as follows:

​

​	​	​	​
(in thousands)	​	​	​
2022 (remaining 9 months)		$	88
2023	​		96
2024	​		74
2025	​		42
2026	​		9
Thereafter	​		11
​	​	$	320

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