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Patents and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2019
Patents and Other Intangible Assets |
Schedule of Patents and other intangible assets | Patents and other intangible assets are summarized as follows:
|  | September 30, |  | December 31,
|  | 2019 |  | 2018
|  | (Unaudited) |  |  |
Patents |  |  |  |  |  |
Patents pending |  | $ | 847,000 |  | $ | 1,202,000
Issued patents |  |  | 558,000 |  |  | 761,000
|  |  | 1,405,000 |  |  | 1,963,000
Trademarks |  |  |  |  |  |
Trademarks pending |  |  | 64,000 |  |  | 55,000
Registered trademarks |  |  | 23,000 |  |  | 23,000
|  |  | 87,000 |  |  | 78,000
Other |  |  | 8,000 |  |  | 8,000
|  |  | 1,500,000 |  |  | 2,049,000
Accumulated amortization |  |  | (256,000) |  |  | (290,000)
|  | $ | 1,244,000 |  | $ | 1,759,000
Schedule of future amortization expense | Future amortization expense associated with issued patents and registered trademarks as of September 30, 2019 is estimated as follows (unaudited):
2019 (remaining 3 months) |  | $ | 31,000
2020 |  |  | 123,000
2021 |  |  | 90,000
2022 |  |  | 54,000
2023 |  |  | 21,000
Thereafter |  |  | 6,000
|  | $ | 325,000

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