 Patents included applications for a ‘method of illuminating rooms’, ‘unburnable gasoline’, a ‘writing utensil’, and a ‘show window’ among many others, most of which are assumed to have been produced for sale.The final event of the process which culminated in the marketing of the Chemex was Schlumbohm's final attempt to market the ‘open system’ transitory refrigeration cycle device which he had been perfecting for some years.A working prototype had been exhibited at the 1939 New York World's Fair, claiming to be the cheapest and simplest refrigeration system ever invented.