Note 3 - Patents, Net

12 Months Ended

Dec. 31, 2019

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, 2019

and

2018:

	2019			2018
Patents	$	198,655		$	228,669
Less: accumulated amortization		(52,392	)		(82,213	)
Patents, net	$	146,263		$	146,456

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

$11,662

for the year ended

December 31, 2019

and

$38,296

December 31, 2018,

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

Estimated future amortization expense is as follows:

2019		11,957
2020		10,655
2021		10,251
2022		10,251
2023		10,251
Thereafter		92,898
Total expense	$	146,263