PATENT COSTS (Tables)

9 Months Ended

Sep. 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:

	September 30, 2019			December 31, 2018
Patents	$	1,235,919		$	1,046,216
Accumulated amortization		(673,416	)		(601,738	)
Total	$	562,503		$	444,478

Estimated Aggregate Future Amortization Expense

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

October 1, 2019 – December 31, 2019	$	24,000
2020		78,000
2021		61,000
2022		61,000
2023		61,000
Thereafter		278,000
Total	$	563,000