 Their most important technology was to mold in a small hook under the front axle so that they could be propelled by a lever-driven catapult, far faster than could be obtained by either gravity, or battery powered "supercharger" devices.Topper closed in 1971 and production of Johnny Lightning cars ceased for 23 years.In 2003 Thomas Lowe secured the trademark rights to the Johnny Lightning name for his Playing Mantis company.