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Intangible Assets | 3 Months Ended
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Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Note 5. Intangible Assets The components of our intangible assets at March 31, 2016 are summarized below:
Intangible Asset Class |  | Cost |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted Average Amortization Period
Patents |  | $ | 160,436 |  |  | $ | (118,114 | ) |  | $ | 42,322 |  |  | 17 years
Amortization expense was approximately $3,500 in the first quarter of 2016 and approximately $21,000 for the similar period in 2015. Expected amortization expense for the year ended December 31, 2016 is approximately $14,000. 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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