4. INTANGIBLE ASSETS (Tables)

6 Months Ended

Oct. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

The following table summarizes the Company’s intangible assets as of October 31, 2012:

Asset Category	Value Assigned		Weighted Average Amortization Period (in Years)		Impairments		Accumulated Amortization			Carrying Value (Net of Impairments and Accumulated Amortization)
Patents	$	587,007		11.5	$	-	$	(246,515	)	$	340,492
License Rights		557,287		16.4		-		(103,438	)		453,849
Trademarks		110,157		N/A		-		-			110,157
Total	$	1,254,451			$	-	$	(349,953	)	$	904,498

The following table summarizes the Company’s intangible assets as of April 30, 2012:

Asset Category	Value Assigned		Weighted Average Amortization Period (in Years)		Impairments			Accumulated Amortization			Carrying Value (Net of Impairments and Accumulated Amortization)
Patents	$	546,624		11.7	$	-		$	(233,989	)	$	312,635
License Rights		540,668		16.6		-			(89,429	)		451,239
Trademarks		138,631		N/A		(29,534	)		-			109,097
Total	$	1,225,923			$	(29,534	)	$	(323,418	)	$	872,971