Note C – Patents

The Company’s intangible assets at December 31, 2025 include patents with estimated remaining economic useful lives ranging from approximately eight (8) to fifteen (15) years. For all periods presented, all of the Company’s unexpired patents were subject to amortization. The gross carrying amounts and accumulated amortization related to acquired intangible assets as of December 31, 2025 and 2024 were as follows:

Amortization expense for the years ended December 31, 2025 and 2024 was $141,000 and $120,000, respectively. Future amortization of current intangible assets, net is as follows:

The expiration dates for the M2M/IoT Portfolio range from September 2033 to May 2034. The expiration dates within the Company’s HFT Patent Portfolio range from October 2039 to February 2040.The expiration dates of patents within the Company’s Smart Home Patent Portfolio range from May 2039 to May 2040. All of the patents within the Company’s Mirror Worlds Patent Portfolio, Cox Patent Portfolio and the Remote Power Patent have expired.