History
The origins of the pintle injector were early laboratory experimental apparatus, used by Caltech and JPL in the mid-1950s, to study propellant mixing and combustion reaction times of hypergolic liquid propellants. The pintle injector was reduced to practice and developed by Space Technology Laboratories (STL), then a division of Ramo-Wooldridge Corp., later TRW starting in 1960; however, it was not until October 1972 that U.S. Patent 3,699,772 for invention of the pintle injector was granted to Gerry Elverum, of TRW and made public.
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