Intangible assets

12 Months Ended

Dec. 31, 2013

Intangible assets [Abstract]

Intangible assets

5. Intangible assets

At December 31, 2013 and December 31, 2012, intangible assets and accumulated intangible assets were comprised of the following:

	2013			2012
Intangible assets	$	54,719,918		$	25,702,909
Accumulated amortization		(8,511,833	)		(5,216,117	)
Intangible assets, net	$	46,208,085		$	20,486,792

BioTime amortizes its intangible assets over an estimated period of 10 years on a straight line basis.  BioTime recognized $3,295,716 in amortization expense of intangible assets during the year ended December 31, 2013.  Amortization expense for the year ended December 31, 2012 amounted to $2,446,975.  See Notes 11, 12, 13, 14, and 15.

Amortization of intangible assets for periods subsequent to December 31, 2013 is as follows:

Year Ended	Amortization
December 31,	Expense
2014	$	5,472,123
2015		5,472,123
2016		5,472,123
2017		5,472,123
Thereafter		24,319,593
Total	$	46,208,085