United States patent 20120234196A1, Peter Joseph Beck & Adam Michael Berry, "Viscous Liquid Monopropellant", issued 15 May 2018, assigned to Rocket Lab USA Inc.
Rocket Lab News - ウェイバックマシン(2011年7月23日アーカイブ分) "December 2010 - Rocket Lab was awarded a US contract from the Operationally Responsive Space Office (ORS) to study low cost international alternatives. Included in this study is a 640,000Ns booster, a miniature avionics system and a launch vehicle to place small mass satellites into polar and low Earth orbits."