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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