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7. PATENTS | 12 Months Ended
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Sep. 30, 2019
Finite-Lived Intangible Assets, Net [Abstract] |
7. PATENTS | Patents consist of the following at September 30:
|  | 2019 |  |  | 2018 |
Patents |  | $ | 841,397 |  |  | $ | 742,698 |
Accumulated amortization |  |  | (529,811 | ) |  |  | (484,605 | )
Patents, net |  | $ | 311,586 |  |  | $ | 258,093 |
During the years ended September 30, 2019 and 2018, there was no impairment of patent costs. Amortization expense for the years ended September 30, 2019 and 2018 totaled approximately $45,000 and $75,000, respectively. The total estimated future amortization is as follows:
Years ending September 30, |  |  |
2020 |  |  | 51,000 |
2021 |  |  | 48,000 |
2022 |  |  | 44,000 |
2023 |  |  | 33,000 |
2024 |  |  | 26,000 |
Thereafter |  |  | 110,000 |
|  | $ | 312,000 |

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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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