Both had examined Goodyear's vulcanized rubber in 1842, but several chemists testified that it would not have been possible to determine how it was made by studying it.
Molemmat valmistajat olivat tutkineet Goodyearin vulkanoitua kumia vuonna 1842, mutta useat kemistit todistivat, ettei vulkanisointimenetelmää voitu toistaa pelkästään sitä havainnoimalla.