Intangible assets

12 Months Ended

Dec. 31, 2012

Intangible assets [Abstract]

Intangible assets

5. Intangible assets

At December 31, 2012 and December 31, 2011, intangible assets and accumulated intangible assets were comprised of the following:

	2012		2011
Intangible assets	$	25,702,909	$	21,429,488
Accumulated amortization		(5,216,117)		(2,809,972	)
Intangible assets, net	$	20,486,792	$	18,619,516

BioTime amortizes its intangible assets over an estimated period of 10 years on a straight line basis.  BioTime recognized $2,446,975 in amortization expense of intangible assets during the year ended December 31, 2012.  The difference between the amortization expense recognized in the consolidated statement of operations and the increase in accumulated amortization of $40,830per the consolidated balance sheet is entirely attributed to foreign currency rates.  Amortization expense for the year ended December 31,2011 amounted to $1,991,200. See Note 11, 12, 13, 14, and 15.

Amortization of intangible assets for periods subsequent to December 31, 2012 is as follows:

Year Ended	Amortization
December 31,	Expense
2013	$	2,570,291
2014		2,570,291
2015		2,570,291
2016		2,570,291
2017		2,570,291
Thereafter		7,635,337
Total	$	20,486,792