Patents:

12 Months Ended

Jul. 31, 2011

Patents Disclosure [Abstract]

Patent Disclosure [Text Block]

Note 5 - Patents:

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

	July 31,
	2011		2010
Patents	$	6,487,389	$	6,221,777
Less:  Accumulated Amortization		3,137,801		2,688,089
Patents, Net	$	3,349,588	$	3,533,688
Weighted Average Life	11.2 years		11.7 years

Amortization expense amounted to $430,650, $407,746, $390,773 for the years ended July 31, 2011, 2010 and 2009, respectively. Amortization expense is expected to be approximately $414,000 per year for the years ended July 31, 2012 through 2016.  During the years ended July 31, 2011, 2010 and 2009, the Company did not write off any patents.