Patents and Licenses

3 Months Ended

Mar. 31, 2021

Patents and Licenses

5- Patents and Licenses

(5)	Patents and Licenses
	Purchased patents and license fees paid for the use of other entities’ patents are amortized over the useful life of the patent or license. The following tables provide information regarding patents and licenses (dollars in thousands):

March 31, 2021						December 31, 2020
Weighted Average Original Life (years)		Gross Carrying Amount		Accumulated Amortization		Weighted Average Original Life (years)		Gross Carrying Amount		Accumulated Amortization
	15.67	$	13,840	$	12,449		15.67	$	13,840	$	12,419

Aggregate amortization expense for patents and licenses was $30,000 in each of the three months ended March 31, 2021 and 2020.

Estimated future amortization expense for each of the years set forth below ending December 31 is as follows (in thousands):

2022	$	117
2023	$	113
2024	$	113
2025	$	112
2026	$	112