G. PATENTS

3 Months Ended

Dec. 31, 2019

Intangible Assets, Net (Excluding Goodwill) [Abstract]

G. PATENTS

During the three months ended December 31, 2019 and 2018, no patent impairment charges were recorded. For the three months ended December 31, 2019 and 2018, amortization of patent costs totaled approximately $13,000 and $12,000, respectively. Approximate estimated future amortization expense is as follows:

Nine months ending September 30, 2020	$	39,000
Year ending September 30,
2021		49,000
2022		45,000
2023		35,000
2024		27,000
2025		24,000
Thereafter		92,000
Total	$	311,000