PATENT COSTS (Tables)

3 Months Ended

Mar. 31, 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:

	March 31, 2019			December 31, 2018
Patents	$	1,046,216		$	1,046,216
Accumulated amortization		(620,538	)		(601,738	)
	$	425,678		$	444,478

Estimated Aggregate Future Amortization Expense

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

April 1, 2019 – December 31, 2019	$	56,400
2020		58,300
2021		41,500
2022		41,400
2023		41,500
Thereafter		186,600