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Intangible Assets | 6 Months Ended
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Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Note 6. Intangible Assets The components of our intangible assets at June 30, 2016 are summarized below:
Intangible Asset Class |  | Cost |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted Average Amortization Period |
Patents and licenses |  | $ | 160,436 |  |  | $ | (121,609 | ) |  | $ | 38,827 |  |  |  | 15 years |
Amortization expense was approximately $3,495 and $21,000 in the second quarter of 2016 and 2015 respectively. The expected future annual amortization expense for each of the next five years based on current balances of our intangible assets is approximately as follows:
For the year ending December 31: |  |  |
2016 |  | $ | 13,978 |
2017 |  | $ | 8,306 |
2018 |  | $ | 8,306 |
2019 |  | $ | 8,306 |
2020 |  | $ | 6,922 |

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