PATENTS

12 Months Ended

Sep. 30, 2023

PATENTS

PATENTS

6. PATENTS

Patents consist of the following at September 30:

	2023			2022
Patents	$	853,445		$	893,833
Accumulated amortization		(655,741	)		(681,632	)
Patents, net	$	197,704		$	212,201

During the years ended September 30, 2023 and 2022, there was no impairment of patent costs. The weighted average amortization period for patents is approximately 8 years. Amortization expense for the years ended September 30, 2023 and 2022 totaled approximately $38,000 and  $49,000, respectively.   The total estimated future amortization is as follows:

Years ending September 30,
2024	$	32,000
2025		29,000
2026		25,000
2027		22,000
2028		19,000
Thereafter		71,000
	$	198,000