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Patents and Other Intangible Assets - Summary (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Patents	$ 1,134,000	$ 1,614,000
Trademarks	96,000	128,000
Other	8,000	8,000
Patents and other intangible assets	1,238,000	1,750,000
Accumulated amortization	(296,000)	(448,000)
Finite-Lived Intangible Assets, Net	942,000	1,302,000
Patents Pending
Patents	596,000	731,000
Issued Patents
Patents	538,000	883,000
Trademarks Pending
Trademarks	1,000	105,000
Registered Trademarks
Trademarks	$ 95,000	$ 23,000

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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