F. PATENTS

6 Months Ended

Mar. 31, 2019

Intangible Assets, Net (Excluding Goodwill) [Abstract]

F. PATENTS

During the six months ended March 31, 2019 and 2018, no patent impairment charges were recorded. For the six and three months ended March 31, 2019, amortization of patent costs totaled approximately $23,000 and $11,000, respectively. For the six and three months ended March 31, 2018, amortization of patent costs totaled approximately $19,000 and $9,000, respectively. Approximate estimated future amortization expense is as follows:

Six months ending September 30, 2019	$	20,000
Year ending September 30,
2020		39,000
2021		36,000
2022		31,000
2023		21,000
2024		18,000
Thereafter		78,000
Total	$	243,000