assignment of intellectual property agreements. In addition, we generally control access to our proprietary and confidential information through the use of internal and external controls.
Our foundational technology in the area of miniature Mass Spec originated as an effort at Oak Ridge National Laboratories led by our Scientific Founder J. Michael Ramsey, Professor Emeritus of Chemistry at the University of North Carolina.
As of December 31, 2023, our owned patent assets included approximately 19 U.S. patents, no pending U.S. patent applications, 45 foreign patents and four pending foreign patent applications in various foreign jurisdictions, including Australia, Austria, Canada, China, France, Germany, the European Union, or EU, Hong Kong, Israel, Japan, South Korea, Singapore, Switzerland and Taiwan. The subject matter covered by our owned patent assets includes core aspects of compact Mass Spec technology, a design for a handheld Mass Spec device, a design for a modular Mass Spec chamber, patents for multiple ionization modes and adaptive pressure operation within survey period, the determination of preferred ionization mode, adaptive resolution control, adaptive operation to reduce power consumption, and the detection of positive and negative ions.
As of December 31, 2023, our in-licensed patent assets included approximately 29 U.S. patents, one pending U.S. patent application, 22 foreign patents, and two pending foreign patent applications. The subject matter covered by our in-licensed patent assets includes a microfabricated ionization source and a microfabricated ionizer chip, microscale Mass Spec systems, devices and related methods, a miniature charged particle trap with an elongated trapping region for Mass Spec, high pressure Mass Spec signal enhancement by means of convective transport, electrospray ionization interface to high pressure Mass Spec, a method of sample injection for chemical separations in microfluidic devices, integrated sample processing for electrospray ionization devices, and microchips with integrated multiple electrospray ionization emitters and related methods, systems and devices. Excluding any patent term extension, the currently issued 908 Devices-owned patents are expected to expire between 2032 to 2038. The currently issued in-licensed patents are expected to expire from 2023 to 2039.
We also seek to protect our brand through procurement of trademark rights. As of December 31, 2023, we owned six registered trademarks in the United States, 17 registered foreign trademarks, three U.S. pending trademark applications, and two pending foreign trademark applications. Our registered trademarks and pending trademark applications include trademarks for 908 Devices, Rebel, MX908, ZipChip, Maven, Maverick, and our logo. In order to supplement protection of our brand, we have also registered several internet domain names.
Licensed IP
University of North Carolina, Chapel Hill
In June 2012, we entered into a license agreement, which was subsequently amended in April 2013 and August 2014, and then amended and restated in May 2015, which we refer to in this Annual Report on Form 10-K as the UNC Agreements, with the University of North Carolina, Chapel Hill, or UNC, pursuant to which UNC granted us an exclusive, sublicensable, worldwide license to develop, manufacture, use, and commercialize products, services and methods, covered by certain patent rights owned by UNC, including patents related to a microfabricated ionization source and a microfabricated ionizer chip.
We issued an aggregate of 110,626 shares of our common stock to UNC, which had an aggregate fair value at the time of issuance of approximately $37,800. Additionally, we must pay UNC a low single digit percentage royalty on our net sales of any products that are covered by a valid claim of the licensed patents, subject to an annual minimum royalty payment of $30,000. We are also obligated to pay UNC a low double-digit percentage of certain royalty income received from our sublicensees. To date, we have not issued any sublicenses under the UNC Agreements.
We are obligated to use commercially reasonable efforts to develop, manufacture and commercialize the Licensed Products and achieve defined milestones within the UNC Agreements. There are no future milestone payments to be made by the Company under the UNC Agreements.