PATENTS

12 Months Ended

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