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Intangible Assets
 9 Months Ended
Oct. 28, 2012
Notes to financial statements [Abstract]  
Intangible Assets
Intangible Assets
 
The components of our amortizable intangible assets are as follows:

 
October 28, 2012
 
January 29, 2012
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated Amortization
 
Net Carrying
Amount
 
(In thousands)
Acquisition-related intangible assets
$
172,039

 
$
(92,063
)
 
$
79,976

 
$
172,039

 
$
(79,261
)
 
$
92,778

Patents and licensed technology
408,552

 
(157,280
)
 
251,272

 
352,386

 
(119,028
)
 
233,358

Total intangible assets
$
580,591

 
$
(249,343
)
 
$
331,248

 
$
524,425

 
$
(198,289
)
 
$
326,136



The increase in gross carrying amount of intangible assets is primarily due to an agreement entered into during the first quarter of fiscal year 2013 to acquire a patent portfolio for our CPB operating segment.

Amortization expense associated with intangible assets for the three and nine months ended October 28, 2012 was $17.3 million and $51.1 million, respectively. Amortization expense associated with intangible assets for the three and nine months ended October 30, 2011 was $16.4 million and $42.9 million, respectively. Amortization expense increased compared to the prior year primarily due to the addition of a patent portfolio. Please refer to Note 8 of these Notes to Condensed Consolidated Financial Statements for further information regarding the Icera business combination. Future amortization expense related to the net carrying amount of intangible assets at October 28, 2012 is estimated to be $17.0 million for the remainder of fiscal year 2013, $66.3 million in fiscal year 2014, $66.2 million in fiscal year 2015, $60.8 million in fiscal year 2016, $50.6 million in fiscal year 2017 and a total of $70.3 million in fiscal year 2018 and fiscal years subsequent to fiscal year 2018.