Note 5 — Intangible Assets

Intangible assets, net consisted of the following:

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At December 31, 2022 and 2021, the Company had capitalized $341,610 and $306,640, respectively, for costs related to patents that have not been awarded. Costs related to patents that have not been awarded are not amortized until patent issuance. During the years ended December 31, 2022 and 2021, the Company wrote-off $0 and $528, respectively, in previously capitalized patent costs.

Amortization expense amounted to $149,308 and $132,330 for the years ended December 31, 2022 and 2021, respectively. Amortization expense for the succeeding five years and thereafter is $152,904 (2023-2027) and $930,301 (thereafter).