Quiet Spike was a collaborative program between Gulfstream Aerospace and NASA's Dryden Flight Research Center to investigate the suppression of sonic booms. The patent was published with the United States Patent and Trademark Office in 2004 and is owned by Gulfstream Aerospace as part of a growing number of supersonic aircraft technology patents in the Gulfstream portfolio. For example, the sonic boom from the Concorde traveling at a speed of Mach 2 was about 2 pounds per square foot.