PATENT COSTS (Tables)

6 Months Ended

Jun. 30, 2019

PATENT COSTS [Abstract]

Net Patent Costs

Patent costs may be creditable against future royalty revenues. For each period presented below, net patent costs consisted of:

	June 30, 2019			December 31, 2018
Patents	$	1,138,797		$	1,046,216
Accumulated amortization		(644,941	)		(601,738	)
Total	$	493,856		$	444,478

Estimated Aggregate Future Amortization Expense

The estimated aggregate amortization expense for the remaining six months of 2019 and each of the years below is approximately as follows:

July 1, 2019 – December 31, 2019	$	43,000
2020		68,000
2021		51,000
2022		51,000
2023		51,000
Thereafter		230,000
Total	$	494,000