In 2259, Khan Noonien Singh acquired the transwarp equation from Section 31. He utilized the equation devised by Montgomery Scott on an unauthorized portable transwarp beaming device to flee from his attack on Starfleet Headquarters in San Francisco. The device had several markings including D-24 on a button, VLC 2315.DS on the casing and SCI-2308.961 - EXP63B next to a display screen.
Khan utilized the device to perform a long-range site-to-site transport all the way from the cockpit of the stolen jumpship 208 on Earth to Ketha Province on Qo'noS, the capital planet of the Klingon Empire and homeworld of the Klingons. The device was recovered from the crashed wreckage of the jumpship by Scott. (Star Trek Into Darkness)