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Patents
 3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Patents

6.

Patents


Included in other assets at March 31, 2018 and December 31, 2017 are capitalized patent costs as follows:


 

 

March 31,

2018

 

December 31,

2017

 

 

 

 

 

 

 

Patent costs

 

$

579,065

 

$

558,873

 

Less accumulated amortization

 

 

(65,888

)

 

(62,153

)

 

 

$

513,177

 

$

496,720

 


Amortization expense for the three months ended March 31, 2018 and 2017 amounted to $3,735 and $3,395, respectively.