Inventing the perfect coffeemaker
The Chemex coffeemaker was a consequence of intersection of Schlumbohm's scientific and marketing interests. Between his first American trip in 1931 and the filing of the U.S. patent for Chemex, Schlumbohm applied for dozens of patents, focused on his core specialty of refrigeration but also wildly diverse. 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. Schlumbohm considered this to be the invention that would provide the financial independence he had been seeking since his graduation more than a decade before, and had in fact been working on versions of the same device since 1929. Finally, an investor offered to provide sufficient money to put the prototype into production, but demanded a controlling interest in the company which would produce the device. Schlumbohm refused the overture, which placed him in a difficult financial predicament. “To afford that refusal, I had to take an appraising look at the other arrows in my quiver. There was this new patent for the coffeemaker, with its broad appeal. Within a week, I had sold half-an-interest in it for $5000 and planned to license it.” Schlumbohm’s patent No. 2,241,368 for a ‘Filtering Device’ had been filed on April 13, 1939. The original version included a spout and handle, much more complex than the final familiar version, and was intended for multiple uses, including laboratory filtering processes.


