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

       
June 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     $ 920,085     $ 1,526,215     $ 2,038,300     $ 815,177     $ 1,223,123  
Patent application costs
  
Varied (1)
     867,948       248,089       619,859       843,693       218,957       624,736  
                                                     
        $ 3,314,248     $ 1,168,174     $ 2,146,074     $ 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 June 30, 2011 the weighted average remaining useful life of these assets in service was 14.2 years.