Intangible assets

9 Months Ended

Sep. 30, 2012

Intangible assets [Abstract]

Intangible assets

4. Intangible assets

At September 30, 2012 and December 31, 2011, intangible assets and intangible assets net of amortization were comprised of the following:

	September 30, 2012 (unaudited)			December 31, 2011
Intangible assets	$	25,664,015		$	21,429,488
Accumulated amortization		(4,574,354	)		(2,809,972	)
Intangible assets, net	$	21,089,661		$	18,619,516

BioTime amortizes its intangible assets over an estimated period of 10 years on a straight line basis.  BioTime recognized $1,764,382 and $1,626,476 in amortization expense of intangible assets during the nine months ended September 30, 2012 and 2011, respectively.