IPSCO 2006 Annual Report

The gross carrying amount and accumulated amortization of goodwill and other intangible assets are as follows:

	Weighted Average Amortization Period	Gross Amount		Accumulated Amortization
Unamortized intangible asset:
Goodwill	Not amortized	$	598,310		$	—
Trade name and trademarks	Not amortized	8,100			—
Total unamortized intangible assets		$	606,410		$	—
Amortized intangible assets
Trade name and trademarks	4.7	$	16,500		$	300
Proprietary technology	15.0	10,587			228
Customer relationships	14.6	652,127			4,143
Non-compete agreements	3.1	17,693			502
Total amortized intangible assets	14.0	$	696,907		$	5,173

The goodwill and intangible assets result primarily from the NS Group, Inc acquisition, described in Note 4. Amortization expense related to intangible assets for 2006 was $5,173. The estimated aggregate amortization expense for intangible assets for each of the five succeeding fiscal years is as follows: