Note H - Intangible Assets

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Intangible Assets Disclosure [Text Block]

NOTE H

—INTANGIBLE ASSETS

Intangible assets consisted of the following as of

December

31:

	2017							2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount

Patents and patents pending	$	347,946	$	(166,842	)	$	181,104	$	287,248	$	(153,116	)	$	134,132

Total	$	347,946	$	(166,842	)	$	181,104	$	287,248	$	(153,116	)	$	134,132

Aggregate amortization expense for

2017

and

2016

was

$13,726

and

$13,606,

respectively. Amounts are recorded in Research, Development and engineering expense. The estimated aggregate amortization expense of intangible assets for the years following

December

31,

2017

is approximately

$14,000

per year for

2018

through

2022,

and approximately

$111,000

thereafter.