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Patents | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Patents | 7. Patents
|  | 2018 Cost |  |  | Accumulated Amortization |  |  | 2018 Net |
Patents |  | $ | 194,320 |  |  | $ | 131,306 |  |  | $ | 63,014 |
|  | 2017 Cost |  |  | Accumulated Amortization |  |  | 2017 Net |
Patents |  | $ | 212,426 |  |  | $ | 132,974 |  |  | $ | 79,452 |
Decrease in 2018 cost was due to currency conversion. 2018 cost in Canadian dollars - $265,102 (2017 - $265,102 in Canadian dollars). Amount of amortization for 2018: $16,438 (2017: $16,438) and is included in cost of sales in the consolidated statements of income and comprehensive income. Estimated amortization expense over the next four years is as follows:
2019 |  | $ | 16,438 |
2020 |  |  | 16,438 |
2021 |  |  | 16,438 |
2022 |  |  | 13,700 |

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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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