Intangible assets, net consisted of the following:

 

 

Amortization expense amounted to $24,713 and $49,032 for the three and six months ended June 30, 2018, respectively, and $18,594 and $36,469 for the three and six months ended June 30, 2017, respectively. Amortization expense for the succeeding five years and thereafter is approximately $49,000 (2018), $99,000 (2019-2022) and $1,162,000 (thereafter).

 

At June 30, 2018 and December 31, 2017, the Company had capitalized $489,285 and $472,928, respectively, for costs related to patents that have not been awarded.