As a housewife, Bentz found that percolators were prone to over-brewing the coffee,espresso-type machines at the time tended to leave grounds in the drink, and linen bag filters were tiresome to clean. She experimented with various means, but ended up usingblotting paper from the school exercise-book of her son Willi and a brass pot perforated using a nail. When the grounds-free, less bitter coffee met with general enthusiasm, she decided to set up a business. The Kaiserliche Patentamt (Imperial Patent Office) granted her a patent on June 20, 1908, and on December 15, the company was entered into the commercial register with 73 Pfennig as "M. Bentz." After contracting a tinsmith to manufacture the devices, they sold 1,200 coffee filters at the 1909 Leipzig fair.
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