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Other Intangible Assets
9 Months Ended
Sep. 30, 2011
Other Intangible Assets
3.     Other Intangible Assets         
 
Other intangible assets are comprised of the following:

     
September 30, 2011
    
December 31, 2010
  
 
Useful Life
  
Gross Carrying Amount
  
Accumulated Amortizaton
  
Net Carrying Amount
  
Gross Carrying Amount
  
Accumulated Amortizaton
  
Net Carrying Amount
  
Acquired intangibles
5 -10 years
   $ 2,446,300     $ 983,042     $ 1,463,258     $ 2,038,300     $ 815,177     $ 1,223,123  
Patent application costs
Varied (1)
     867,334       254,084       613,250       843,693       218,957       624,736  
      $ 3,313,634     $ 1,237,126     $ 2,076,508     $ 2,881,993     $ 1,034,134     $ 1,847,859  
(1)- patent rights are  amortized over their expected useful life which is generally the legal life of the patent.  As of September 30, 2011 the weighted average remaining useful life of these assets in service was approximately 13 years.