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Patents and Other Intangible Assets | 6 Months Ended
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Jun. 30, 2021
Patents and Other Intangible Assets |
Patents and Other Intangible Assets | Note 4 – Patents and Other Intangible Assets Patents and other intangible assets are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31,
​ | ​ | 2021 | ​ | 2020
Patents |  | ​ |  |  | ​ |
Patents pending | ​ | $ | 795,000 | ​ | $ | 731,000
Issued patents | ​ |  | 883,000 | ​ |  | 883,000
​ | ​ |  | 1,678,000 | ​ |  | 1,614,000
Trademarks | ​ |  | ​ | ​ |  | ​
Trademarks pending | ​ |  | 111,000 | ​ |  | 105,000
Registered trademarks | ​ |  | 23,000 | ​ |  | 23,000
​ | ​ |  | 134,000 | ​ |  | 128,000
Other | ​ |  | 8,000 | ​ |  | 8,000
​ | ​ |  | 1,820,000 | ​ |  | 1,750,000
Accumulated amortization | ​ |  | (524,000) | ​ |  | (448,000)
​ | ​ | $ | 1,296,000 | ​ | $ | 1,302,000
​ Future amortization expense associated with issued patents and registered trademarks as of June 30, 2021 is estimated as follows (unaudited): ​
​ | ​ | ​ | ​
2021 (remaining 6 months) |  | ​ | 76,000
2022 | ​ |  | 125,000
2023 | ​ |  | 91,000
2024 | ​ |  | 63,000
2025 | ​ |  | 27,000
​ | ​ | $ | 382,000
​

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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