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Intangible Assets and Goodwill | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets and Goodwill | 4. Intangible Assets and Goodwill
|  | December 31,
Intangible assets consisted of: |  | 2017 |  | 2016
First Aid Only Tradename, Customer List |  | $ | 8,910,010 |  |  | $ | 8,910,010 |
DMT Tradename, Customer List |  |  | 2,756,000 |  |  |  | 2,756,000 |
DMT Non-Compete |  |  | 183,000 |  |  |  | 183,000 |
Patents |  |  | 2,271,980 |  |  |  | 2,271,980 |
Trademarks |  |  | 663,698 |  |  |  | 663,698 |
Pac-Kit Tradename, Customer List |  |  | 1,500,000 |  |  |  | 1,500,000 |
Spill Magic Customer List |  |  | 3,965,000 |  |  |  | — |
Spill Magic Trademarks |  |  | 1,034,000 |  |  |  | — |
Spill Magic Non-Compete |  |  | 67,111 |  |  |  | — |
C-Thru Customer List |  |  | 1,050,000 |  |  |  | 1,050,000 |
Subtotal |  |  | 22,400,799 |  |  |  | 17,334,688 |
Accumulated Amortization |  |  | 4,518,794 |  |  |  | 3,346,502 |
Subtotal Intangible assets |  |  | 17,882,005 |  |  |  | 13,988,186 |
Goodwill |  |  | 4,696,370 |  |  |  | 3,948,235 |
|  | $ | 22,578,375 |  |  | $ | 17,936,421 |
Amortization expense for patents and trademarks for the years ended December 31, 2017, and 2016 were $1,172,292 and $930,941, respectively. The estimated aggregate amortization expense for each of the next five succeeding years, calculated on a similar basis, is as follows: 2018 - $1,215,549; 2019 - $1,165,086; 2020 - $1,160,466; 2021 - $1,158,641; and 2022 - $1,141,933.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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