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6. PATENTS | 12 Months Ended
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Sep. 30, 2016
Accounting Policies [Abstract] |
6. PATENTS | Patents consisted of the following at September 30:
|  | 2016 |  |  | 2015 |
Patents |  | $ | 1,528,610 |  |  | $ | 1,525,791 |
Accumulated amortization |  |  | (1,272,063.00 | ) |  |  | (1,234,227.00 | )
Net Patents |  | $ | 256,547 |  |  | $ | 291,564 |
During the years ended September 30, 2016, 2015 there was no impairment of patent costs and a nominal impairment charge in 2014. Amortization expense for the years ended September 30, 2016, 2015 and 2014 totaled approximately $38,000, $40,000 and $43,000, respectively. The total estimated future amortization is as follows:
Years ending September 30, |  |  |
2017 |  | $ | 37,000 |
2018 |  |  | 36,000 |
2019 |  |  | 35,000 |
2020 |  |  | 31,000 |
2021 |  |  | 28,000 |
Thereafter |  |  | 90,000 |
|  | $ | 257,000 |

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