NOTE 7INTANGIBLE ASSETS

Intangible assets were as follows:

(In thousands)	September 27,		December 28,
	2014		2013
Intangible assets subject to amortization:
Developed technology, net of accumulated amortization of $16,143 and $14,079 as of September 27, 2014 and December 28, 2013, respectively	$	24,227	$	26,805
Customer relationships, net of accumulated amortization of $36,327 and $32,614 as of September 27, 2014 and December 28, 2013, respectively	9,971		13,795
In-process research and development, net of accumulated amortization of $1,310 and $759 as of September 27, 2014 and December 28, 2013, respectively	6,576		7,162
Other, net of accumulated amortization of $6,334 and $6,324 as of September 27, 2014 and December 28, 2013, respectively	998		1,275
	41,772		49,037
Intangible assets not subject to amortization:
Trademarks and trade names	18,305		18,305
Intangible assets, net	$	60,077	$	67,342

Developed technology is amortized on a straight line basis over 10 to 20 years, depending on the life of the product technology. Intangible assets related to customer relationships are generally amortized over a period of up to 10 years on an accelerated basis. In-process research and development is amortized on a straight line basis over the product’s estimated useful life upon completion of the technology. Other intangible assets include acquired backlog, product trademarks and trade names, non-competition agreements and defensible assets. With the exception of product trademarks and trade names, such assets are amortized on a straight line basis over a period of three months to 10 years, depending on the asset. Trademarks and trade names associated with products are amortized on a straight line basis over the estimated remaining life of the product technology, which ranges from 10 to 20 years. Trademarks and trade names associated with a business have indefinite lives and are not amortized.

Amortization expense related to intangible assets totaled $1.9 million and $6.8 million for the three and nine months ended September 27, 2014, respectively, and $2.6 million and $7.7 million for the three and nine months ended September 28, 2013, respectively.

Estimated aggregate amortization expense for future fiscal years is as follows:

(In thousands)	Estimated Aggregate Amortization Expense
2014 (remaining)	$	1,755
2015	6,857
2016	6,484
2017	5,521
2018	3,396
Thereafter	17,355
	$	41,368

The Company has excluded $0.4 million of estimated amortization expense related to certain in-process research and development from the table above, as it was uncertain as of September 27, 2014 when the technology will be completed and when the amortization will begin.