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Patents and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Patents and Other Intangible Assets |
Schedule of Patents and other intangible assets | Patents and other intangible assets are summarized as follows:
|  | December 31,
|  | 2019 |  | 2018
Patents |  |  |  |  |  |
Patents pending |  | $ | 846,000 |  | $ | 1,202,000
Issued patents |  |  | 619,000 |  |  | 761,000
|  |  | 1,465,000 |  |  | 1,963,000
Trademarks |  |  |  |  |  |
Trademarks pending |  |  | 77,000 |  |  | 55,000
Registered trademarks |  |  | 23,000 |  |  | 23,000
|  |  | 100,000 |  |  | 78,000
Other |  |  | 8,000 |  |  | 8,000
|  |  | 1,573,000 |  |  | 2,049,000
Accumulated amortization |  |  | (288,000) |  |  | (290,000)
|  | $ | 1,285,000 |  | $ | 1,759,000
Schedule of future amortization expense | Future amortization expense associated with awarded patents and registered trademarks as of December 31, 2019 is estimated as follows:
2020 |  |  | 131,000
2021 |  |  | 100,000
2022 |  |  | 69,000
2023 |  |  | 41,000
2024 |  |  | 13,000
|  | $ | 354,000

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