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Patents
3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Patents

6.

Patents


Included in other assets at March 31, 2016 and December 31, 2015 are capitalized patent costs as follows:


 

 

March 31,

2016

 

December 31,

2015

 

 

 

 

 

 

 

Patent costs

 

$

394,918

 

$

372,411

 

Less accumulated amortization

 

 

(37,369

)

 

(33,512

)

 

 

$

357,549

 

$

338,899

 


Amortization expense for the three months ended March 31, 2016 and 2015 amounted to $3,858 and $3,180, respectively.