Note 4 – Intangible Assets

Intangible assets, net consisted of the following:

Amortization expense amounted to $19,540 and $36,009 for the three and six months ended June 30, 2019, respectively, and $16,261 and $32,211 for the three and six months ended June 30, 2018, respectively. Amortization expense for the succeeding five years and thereafter is $41,879  (2019), $83,757  (2020‑2023) and $884,888 (thereafter).

At June 30, 2019 and December 31, 2018, the Company had capitalized $385,683 and $354,427, respectively, for costs related to patents that have not been awarded.