This marker, along with a second patent by Brott and his team involving infrared phosphor technology, has recently been licensed to Battle Sight Technologies, which expands to their existing collection of infrared technologies. This technology works similarly to the dials on a watch, absorbing ultraviolet light during the day and emitting an infrared light at night.

https://www.af.mil/News/Article-Display/Article/1935286/afrl-licenses-second-technology-to-local-firm/ Donna Lindner