Patents and Licenses

12 Months Ended

Dec. 31, 2013

(3) Patents and Licenses

Purchased patents and licenses 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):

December 31, 2013						December 31, 2012
Weighted Average Original Life (years)		Gross Carrying Amount		Accumulated Amortization		Weighted Average Original Life (years)		Gross Carrying Amount		Accumulated Amortization
	18.55	$	13,840	$	11,032		14.88	$	11,690	$	10,853

Aggregate amortization expense for patents and licenses was $179,000 for 2013, $162,000 for 2012 and $272,000 for 2011. Estimated future amortization expense for each of the years set forth below ending December 31, is as follows (in thousands):

2014	$ 269
2015	$ 269
2016	$ 269
2017	$ 173
2018	$ 141