5.	PATENT COSTS

We amortize intangible assets with definite lives on a straight-line basis over their remaining estimated useful lives, ranging from one to twelve years, and review for impairment on a quarterly basis and when events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. As of March 31, 2015, there was no indicator that an impairment existed.

We capitalized legal patent costs related to patent prosecution and maintenance. For the three months ended March 31, 2015, we did not increase our capitalized patent costs as no information was reported to us by Auxilium through January 29, 2015 or Endo from January 29, 2015 on. These patent costs are creditable against future royalty revenues. For each period presented below, net patent costs consisted of:

	March 31, 2015			December 31, 2014
Patents	$	671,326		$	671,326
Accumulated Amortization		(387,133	)		(376,296	)
	$	284,193		$	295,030

The amortization expense for patents for the three months ended March 31, 2015 was approximately $11,000. In the comparable period of 2014, the amortization expense for patents was approximately $192,000. The estimated aggregate amortization expense for the, in dollars, for the remaining nine months of 2015 and each of the years below is approximately as follows:

2015	$	33,000
2016		35,000
2017		35,000
2018		35,000
2019		35,000
2020		24,000