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Intangible Assets
 9 Months Ended
Sep. 30, 2013
Intangible Assets

9. Intangible Assets

The gross book value, accumulated amortization and net book value of intangible assets were as follows:

 

 

 

 

 

  

 

 

 

  

 

 

 

  

 

 

 

  

 

(Stated in millions)

  

 

Sept. 30, 2013

 

  

Dec. 31, 2012

 

 

Gross
Book Value

 

  

Accumulated
Amortization

 

  

Net Book
Value

 

  

Gross
Book Value

 

  

Accumulated
Amortization

 

  

Net Book
Value

 

Technology/Technical Know-How             

$

  1,958

  

  

$

  563

  

  

$

  1,395

  

  

$

  1,967

  

  

$

  474

  

  

$

  1,493

  

Tradenames             

 

  1,647

  

  

 

  240

  

  

 

  1,407

  

  

 

  1,647

  

  

 

  188

  

  

 

  1,459

  

Customer Relationships             

 

  2,235

  

  

 

  381

  

  

 

  1,854

  

  

 

  2,115

  

  

 

  312

  

  

 

  1,803

  

Other             

 

  407

  

  

 

  331

  

  

 

  76

  

  

 

  369

  

  

 

  322

  

  

 

  47

  

 

$

  6,247

  

  

$

  1,515

  

  

$

  4,732

  

  

$

  6,098

  

  

$

  1,296

  

  

$

  4,802

  

Amortization expense charged to income was as follows:

 

 

(Stated in millions)

 

 

2013

 

  

2012

 

Third Quarter             

$

  80

  

  

$

  84

  

Nine Months             

$

  244

  

  

$

  245

  

The weighted average amortization period for all intangible assets is approximately 20 years.

Based on the net book value of intangible assets at September 30, 2013, amortization charged to income for the subsequent five years is estimated to be: remainder of 2013—$89 million; 2014—$349 million; 2015—$339 million; 2016—$321 million; 2017—$307 million; and 2018—$300 million.