NOTE D - PATENT LICENSE FEES

Through a 2013 acquisition, the Company acquired certain patents, intellectual property and rights related to the development of Camelina as a biofuels feedstock, as a result of which the Company continues to incur costs related to patent license fees and patent applications for Camelina sativa plant improvements. These acquired assets include three patents and the related intellectual property associated with these patents. These three patents have an expected useful life of 17 years and are carried at cost less any accumulated amortization and any impairment losses. Amortization is calculated using the straight-line method over their remaining patent life. The termination dates of these patents are all in 2029. Any future costs associated with the maintenance of these patents and patent and registration costs for any additional patents that are essential to the Company’s business will be capitalized and amortized over the life of the patent once issued. The patent assets as of the quarter ended March 31, 2020 and 2019 is shown in the following table:

Amortization expense for intangible assets was approximately $61,000 for each of the quarters ended March 31, 2020 and 2019.