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Patents and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Patents and Other Intangible Assets |
Schedule of Patents and other intangible assets | Patents and other intangible assets are summarized as follows:
|  | December 31,
|  | 2020 |  | 2019
|  | (Unaudited) |  |  |
Patents |  |  |  |  |  |
Patents pending |  | $ | 731,000 |  | $ | 846,000
Issued patents |  |  | 883,000 |  |  | 619,000
|  |  | 1,614,000 |  |  | 1,465,000
Trademarks |  |  |  |  |  |
Trademarks pending |  |  | 105,000 |  |  | 77,000
Registered trademarks |  |  | 23,000 |  |  | 23,000
|  |  | 128,000 |  |  | 100,000
Other |  |  | 8,000 |  |  | 8,000
|  |  | 1,750,000 |  |  | 1,573,000
Accumulated amortization |  |  | (448,000) |  |  | (288,000)
|  | $ | 1,302,000 |  | $ | 1,285,000
Schedule of future amortization expense | Future amortization expense associated with awarded patents and registered trademarks as of December 31, 2020 is estimated as follows:
2021 |  |  | 152,000
2022 |  |  | 125,000
2023 |  |  | 91,000
2024 |  |  | 64,000
Thereafter |  |  | 26,000
|  | $ | 458,000

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