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PATENTS | 12 Months Ended
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Sep. 30, 2020
PATENTS |
6. PATENTS |
6. | PATENTS
| Patents consist of the following at September 30:
|  | 2020 |  |  | 2019 |
Patents |  | $ | 896,372 |  |  | $ | 841,397 |
Accumulated amortization |  |  | (582,950 | ) |  |  | (529,811 | )
Patents, net |  | $ | 313,422 |  |  | $ | 311,586 |
| During the years ended September 30, 2020 and 2019, there was no impairment of patent costs. Amortization expense for the years ended September 30, 2020 and 2019 totaled approximately $53,000 and $45,000, respectively. The total estimated future amortization is as follows:
Years ending September 30, |
2021 |  |  | 52,000 |
2022 |  |  | 48,000 |
2023 |  |  | 38,000 |
2024 |  |  | 30,000 |
2025 |  |  | 28,000 |
Thereafter |  |  | 117,000 |
|  | $ | 313,000 |

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