PATENTS

9 Months Ended

Jun. 30, 2021

PATENTS

G. PATENTS

G. PATENTS

During the nine months ended June 30, 2021 and 2020, no patent impairment charges were recorded. For the nine months ended June 30, 2021 and 2020, amortization of patent costs totaled approximately $39,000 and $40,000, respectively. For the three months ended June 30, 2021 and 2020, amortization of patent costs totaled approximately $13,000 and $14,000, respectively. Approximate estimated future amortization expense is as follows:

Three months ending September 30, 2021	$	13,000
Year ending September 30,
2022		48,000
2023		38,000
2024		31,000
2025		28,000
2026		24,000
Thereafter		97,000
Total	$	279,000