Intangible assets, net

3 Months Ended

Mar. 31, 2015

Intangible assets, net [Abstract]

Intangible assets, net

5. Intangible assets, net

At March 31, 2015 and December 31, 2014, intangible assets and intangible assets net of amortization were comprised of the following:

	March 31, 2015 (Unaudited)			December 31, 2014
Intangible assets	$	52,562,549		$	52,562,549
Accumulated amortization		(15,028,247	)		(13,714,153	)
Intangible assets, net	$	37,534,302		$	38,848,396

BioTime amortizes its intangible assets generally over an estimated period of 10 years on a straight line basis. BioTime recognized $1,314,094 and $1,367,998 in amortization expense of intangible assets, included in research and development, during the three months ended March 31, 2015 and 2014, respectively.