Note 3 - Patents, Net

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Goodwill and Intangible Assets Disclosure [Text Block]

3.

Patents, net

Patents are stated at cost less accumulated amortization and consist of the following at

December 31, 2018

and

2017:

	2018			2017
Patents	$	228,669		$	338,324
Less: accumulated amortization		(82,213	)		(155,938	)
Patents, net	$	146,456		$	182,386

During the year ended

December 31, 2018,

$112,022

original cost of the patents, with associated accumulated amortization of

$96,055

were written off due to its obsolete status. The residual book value of

$15,967

was expensed as additional amortization expense.

Amortization expense amounted to

$38,296

for the year ended

December 31, 2018

and

$22,773

December 31, 2017,

respectively, and is included in selling, general and administrative expenses.

Estimated future amortization expense is as follows:

2019		11,582
2020		11,494
2021		9,838
2022		9,434
Thereafter		104,108
Total expense	$	146,456