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Intangible Assets | 6 Months Ended
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Jun. 30, 2019
Intangible Assets |
Intangible Assets | 6 — Intangible Assets The following table summarizes the components of intangible asset balances:
|  | June 30, |  | December 31,
|  | 2019 |  | 2018
|  | (unaudited) |  |  |
Patents — in use |  | $ | 304,270 |  | $ | 304,270
Patents — in process |  |  | 87,053 |  |  | 73,164
Internally developed software — in use |  |  | 867,569 |  |  | 867,569
Internally developed software — in process |  |  | 34,233 |  |  | 13,723
Trademarks |  |  | 23,017 |  |  | 23,017
|  |  | 1,316,142 |  |  | 1,281,743
Accumulated amortization |  |  | (494,205) |  |  | (449,224)
Total |  | $ | 821,937 |  | $ | 832,519
Amortization expense of intangible assets was $22,490 and $22,491 for the three months ended June 30, 2019 and 2018, respectively, and $44,981 and $44,351 for the six months ended June 30, 2019 and 2018, respectively. Expected annual amortization expense for the remaining portion of 2019 and the next five years related to intangible assets is as follows (excludes in process intangible assets):
Six months ending December 31, 2019 |  | $ | 44,982
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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