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6. PATENTS | 12 Months Ended
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Sep. 30, 2017
Accounting Policies [Abstract] |
6. PATENTS | Patents consisted of the following at September 30:
| 2017 |  | 2016
Patents | $ 1,535,087 |  | $ 1,528,610
Accumulated amortization | (1,311,920) |  | (1,272,063)
Patents, net | $ 223,167 |  | $ 256,547
During the years ended September 30, 2017 and 2016,there was no impairment of patent costs. Amortization expense for the years ended September 30, 2017 and 2016 totaled approximately $40,000 and $38,000, respectively. The total estimated future amortization is as follows:
Years ending September 30,
2018 | $ 37,000
2019 | 35,000
2020 | 32,000
2021 | 28,000
2022 | 25,000
Thereafter | 66,000
| $ 223,000

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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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