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Patents (Tables)
 12 Months Ended
Jul. 31, 2013
Accounting Policies [Abstract]  
Costs and accumulated amortization of patents
    July 31,  
    2013     2012  
             
Patents   $ 5,657,455     $ 5,587,790  
                 
Less:  Accumulated Amortization     3,338,039       2,953,332  
                 
Patents, Net   $ 2,319,416     $ 2,634,458  
                 
Weighted Average Life     8.6 years       9.4 years