Note 4 – Intangible Assets

Intangible assets, net consisted of the following:

Amortization expense amounted to $21,554 and $57,563 for the three and nine months ended September 30, 2019, respectively, and $16,323 and $48,534 for the three and nine months ended September 30, 2018, respectively. Amortization expense for the succeeding five years and thereafter is $21,771  (2019), $87,084  (2020‑2023) and $936,428 (thereafter).

At September 30, 2019 and December 31, 2018, the Company had capitalized $339,020 and $354,427, respectively, for costs related to patents that have not been awarded.