PATENTS

3 Months Ended

Dec. 31, 2022

PATENTS

PATENTS

G. PATENTS

During the three months ended December 31, 2022 and 2021, the Company recorded approximately $0 and $31,000 in patent impairment charges. During the three months ended December 31, 2022 and 2021, amortization of patent costs totaled approximately $10,000 and $14,000, respectively. Approximate estimated future amortization expense is as follows:

Nine months ending September 30, 2023	$	28,000
Year ending September 30,
2024		30,000
2025		28,000
2026		24,000
2027		21,000
2028		17,000
Thereafter		54,000
Total	$	202,000