NOTE 6 – INTANGIBLE ASSETS

On June 30, 2021, our intangible assets included patent costs totaling $91,512 (of which $58,762 represents patent pending costs which are not subject to amortization) less accumulated amortization of patent costs of $11,329 and license costs totaling $241,909 less accumulated amortization of license costs of $29,376. On December 31, 2020, our intangible assets included patent costs totaling $158,710 (of which $133,112 represented patent pending costs which are not subject to amortization) less accumulated amortization of patent costs of $3,809 and license costs totaling $241,909 less accumulated amortization of license costs of $17,280. Amortization expense for the three months ended June 30, 2021 and 2020 was $6,867 and $5,824, respectively. Amortization expense for the six months ended June 30, 2021 and 2020 was $19,617 and $6,464, respectively.

Estimated amortization expense for the next five years for the patent and license costs currently being amortized is as follows: