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H. PATENTS

6 Months Ended

Mar. 31, 2018

During the six and three months ended March 31, 2018 and 2017, no patent impairment charges were recorded. For the six and three months ended March 31, 2018, amortization of patent costs totaled approximately $19,000 and $9,000, respectively. For the six and three months ended March 31, 2017 amortization of patent costs totaled approximately $19,000 and $10,000, respectively. Approximate estimated future amortization expense is as follows:

Six months ending September 30, 2018	$	18,000
Year ending September 30,
2019		35,000
2020		32,000
2021		29,000
2022		25,000
2023		15,000
Thereafter		53,000
Total	$	207,000