Note 7. Intangibles

The following table presents the gross carrying amount and accumulated amortization of intangible assets as of April 1, 2012 (in thousands):


	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
Developed technology	$	40,200	$	12,735	$	27,465		5 years
In-process research and development		1,900		69		1,831		7 years
Customer relationships		17,600		1,286		16,314		11 years
Trademarks		5,200		411		4,789		10 years
Lease agreements		2,600		357		2,243		8 years

Total acquired intangible assets from Vocollect acquisition:		67,500		14,858		52,642

Other intangibles		14,341		9,680		4,661		5 years

Total	$	81,841	$	24,538	$	57,303

Total amortization expense on intangibles for the three months ended April 1, 2012 and April 3, 2011 was $4.7 million and $1.3 million, respectively. Estimated future amortization expense for intangible assets for the next five years is as follows (in thousands):


Year	Amount
2012	$	18,558
2013		16,367
2014		8,865
2015		6,005
2016		3,482