NOTE C – PATENTS

The Company’s intangible assets at June 30, 2026 include patents with estimated remaining economic useful lives ranging from approximately 7 to 13 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 June 30, 2026 and December 31, 2025 were as follows:

Amortization expense for the three months ended June 30, 2026 and 2025 was $44,000 and $37,000, respectively. Amortization expense for the six months ended June 30, 2026 and 2025 was $88,000 and $67,000, respectively. Future amortization of intangible assets for the next five years and thereafter is as follows:

The expiration dates of patents within the Company’s M2M/IoT Patent Portfolio range from September 2033 to December 2034. The expiration dates of patents 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.