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6. PATENTS (Tables)
6 Months Ended
Jun. 30, 2017
Patents Tables  
Patents
   

June 30, 2017

Cost

   

Accumulated

Amortization

   

June 30, 2017

Net

 
Patents   $ 204,288     $ 116,616     $ 87,671  

 

   

December 31, 2016

Cost

   

Accumulated

Amortization

   

December 31, 2016

Net

 
Patents   $ 197,448     $ 101,558     $ 95,890  

 

Estimated depreciation expense
2017   $ 16,438  
2018     16,438  
2019     16,438  
2020     16,438  
2021     16,438