G. PATENTS

9 Months Ended

Jun. 30, 2019

Intangible Assets, Net (Excluding Goodwill) [Abstract]

G. PATENTS

During the nine months ended June 30, 2019 and 2018, no patent impairment charges were recorded. For the nine and three months ended June 30, 2019, amortization of patent costs totaled approximately $72,000 and $49,000, respectively. For the nine and three months ended June 30, 2018, amortization of patent costs totaled approximately $53,000 and $34,000, respectively. Approximate estimated future amortization expense is as follows:

Three months ending September 30, 2019	$	11,000
Year ending September 30,
2020		43,000
2021		40,000
2022		36,000
2023		26,000
2024		21,000
Thereafter		95,000
Total	$	272,000