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5. PATENTS | 12 Months Ended
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Sep. 30, 2015
Accounting Policies [Abstract] |
5. PATENTS | Patents consisted of the following at September 30:
|  |  | 2015 |  |  |  | 2014 |
Patents |  | $ | 1,525,791 |  |  | $ | 1,517,344 |
Accumulated amortization |  |  | (1,234,227 | ) |  |  | (1,193,756 | )
Net Patents |  | $ | 291,564 |  |  | $ | 323,588 |
During the years ended September 30, 2015, 2014 and 2013, the Company recorded patent impairment charges of $0, $1,182 and $22,628, respectively, for the net book value of patents abandoned during the year. These amounts are included in general and administrative expenses. Amortization expense for the years ended September 30, 2015, 2014 and 2013 totaled $40,471, $42,785 and $88,207, respectively. The total estimated future amortization is as follows:
|  |  | Years ending September 30, |
2016 |  | $ | 36,547 |
2017 |  |  | 36,547 |
2018 |  |  | 36,213 |
2019 |  |  | 34,510 |
2020 |  |  | 31,317 |
Thereafter |  |  | 116,430 |
|  | $ | 291,564 |

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