PATENTS

6 Months Ended

Mar. 31, 2022

PATENTS

Patents

G. PATENTS

During the six months ended March 31, 2022 and 2021, respectively, patent impairment charges of approximately $31,000 and $0, were recorded. No patent impairment charges were recorded during the three months ended March 31, 2022 and 2021. For the six months ended March 31, 2022 and 2021, amortization of patent costs totaled approximately $27,000 and $26,000, respectively. For the three months ended March 31, 2022 and 2021, amortization of patent costs totaled approximately $13,000 in each period. Approximate estimated future amortization expense is as follows:

Six months ending September 30, 2022	$	22,000
Year ending September 30,
2023		38,000
2024		30,000
2025		28,000
2026		24,000
2027		21,000
Thereafter		72,000
Total	$	235,000