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Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Intangible Assets |
Intangible Assets | 5 — Intangible Assets The following table summarizes the components of intangible asset balances:
|  | As of December 31,
|  | 2019 |  | 2018
Patents — in use |  | $ | 304,270 |  | $ | 304,270
Patents — in process |  |  | 120,581 |  |  | 73,164
Internally developed software — in use |  |  | 867,569 |  |  | 867,569
Internally developed software — in process |  |  | 80,721 |  |  | 13,723
Trademarks |  |  | 26,133 |  |  | 23,017
|  |  | 1,399,274 |  |  | 1,281,743
Accumulated amortization |  |  | (539,187) |  |  | (449,224)
Total |  | $ | 860,087 |  | $ | 832,519
Amortization expense of intangible assets was $89,963, $89,333 and $82,399 for the years ended December 31, 2019, 2018 and 2017, respectively. Expected annual amortization expense for the next five years related to intangible assets is as follows (excludes in-process intangible assets):
2020 |  | $ | 89,963
2021 |  | $ | 89,963
2022 |  | $ | 89,392
2023 |  | $ | 88,740
2024 |  | $ | 88,439

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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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