6. PATENTS (Tables)

12 Months Ended

Dec. 31, 2016

Patents Tables

Patents

	2016 Cost		Accumulated Amortization		2016 Net
Patents	$	197,448	$	101,558	$	95,890

	2015 Cost		Accumulated Amortization		2015 Net
Patents	$	191,698	$	91,075	$	100,623

Estimated depreciation expense

Estimated amortization expense over the next five years is as follows:

2017	$	16,438
2018		16,438
2019		16,438
2020		16,438
2021		16,438