 She experimented with many means but ended up using blotting paper from her son Willy's school exercise book and a brass pot punctured using a nail.When the grounds-free, less bitter coffee was met with general enthusiasm, she decided to set up a business.The Kaiserliche Patentamt (Imperial Patent Office) granted her a patent on 20 June 1908, and on 15 December the company was entered into the commercial register with 73 pfennig as "M. Bentz".