Patents (Tables)

12 Months Ended

Jul. 31, 2012

Patents Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

The costs and accumulated amortization of patents are summarized as follows:

	July 31,
	2012		2011
Patents	$	5,587,790	$	6,487,389
Less:  Accumulated Amortization		2,953,332		3,137,801
Patents, Net	$	2,634,458	$	3,349,588
Weighted Average Life		9.4 years		11.2 years