This is because she wanted better coffee for her family. She was looking for a way to brew the perfect cup of coffee with none of the bitterness cause by over brewing.
Melitta decided to invent a way to make a filtered coffee, pouring boiling water over ground coffee and having the liquid be filtered, removing any grinds.
The Melitta Automatic drip Coffee Maker was patented by Melitta Bentz in Germany on June 20th, 1908. At the Leipzig trade fair of 1909, she sold over 12 of her “coffee makers.”
Invention of Melitta coffee maker