6. PATENTS

12 Months Ended

Sep. 30, 2016

Accounting Policies [Abstract]

6. PATENTS

Patents consisted of the following at September 30:

	2016			2015
Patents	$	1,528,610		$	1,525,791
Accumulated amortization		(1,272,063.00	)		(1,234,227.00	)
Net Patents	$	256,547		$	291,564

During the years ended September 30, 2016, 2015 there was no impairment of patent costs and a nominal impairment charge in 2014. Amortization expense for the years ended September 30, 2016, 2015 and 2014 totaled approximately $38,000, $40,000 and $43,000, respectively. The total estimated future amortization is as follows:

Years ending September 30,
2017	$	37,000
2018		36,000
2019		35,000
2020		31,000
2021		28,000
Thereafter		90,000
	$	257,000