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6. PATENTS | 12 Months Ended
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Dec. 31, 2016
Notes to Financial Statements |
6. PATENTS | 6. Patents.
|  | 2016 Cost |  |  | Accumulated Amortization |  |  | 2016 Net |
Patents |  | $ | 197,448 |  |  | $ | 101,558 |  |  | $ | 95,890 |
|  | 2015 Cost |  |  | Accumulated Amortization |  |  | 2015 Net |
Patents |  | $ | 191,698 |  |  | $ | 91,075 |  |  | $ | 100,623 |
Increase in 2016 cost was due to currency conversion. 2016 cost in Canadian dollars - $265,102 (2015 - $265,102 in Canadian dollars). Amount of amortization for 2016: $15,616 (2015: $15,867) and is included in cost of sales in the consolidated statements of operations and comprehensive income (loss). Estimated amortization expense over the next five years is as follows:
2017 |  | $ | 16,438 |
2018 |  |  | 16,438 |
2019 |  |  | 16,438 |
2020 |  |  | 16,438 |
2021 |  |  | 16,438 |

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