When was the first paper coffee filter?

The invention of the paper coffee filter was not a product of industrial laboratory research, but a domestic solution to a sensory problem. In 1908, Melitta Bentz sought to eliminate the over-extraction and gritty mouthfeel inherent in the era's common brewing practices. By utilizing blotting paper—a porous, absorbent material—she created a physical barrier that effectively trapped fine particulates and some suspended oils, resulting in a cleaner, more nuanced cup. This innovation shifted the focus of coffee preparation from merely 'making a drink' to controlling the extraction process. For the producer, this was a pivotal moment: the paper filter allowed for a more transparent expression of the coffee's inherent characteristics, as it reduced the masking effect of heavy sediment and bitter compounds. A common misconception is that the cone-shaped filter we recognize today was the original design; in reality, Bentz’s initial patent was for a perforated brass device lined with paper. The iconic cone shape and the standardized filter bags were iterative improvements patented much later, in the 1930s. By moving the filtration process away from the grounds themselves, Bentz provided a mechanism that allowed the consumer to appreciate the work of the farmer with greater clarity, setting the stage for the specialty coffee movement's emphasis on clean, bright, and distinct flavor profiles.