Paper coffee filters were invented in Germany by Melitta Bentz in 1908 and are commonly used for drip brew all over the world. In 1954 the Wigomat, invented by Gottlob Widmann, was patented in Germany being the first electrical drip brewer.
Filter coffee is made by pouring hot water onto ground coffee beans, then allowing to brew. There are several methods for doing this, including using a filter, a percolator, and a french press. Terms used for the resulting coffee often reflect the method used, such as drip brewed coffee, filtered coffee, pour-over coffee, or simply ground coffee. Water seeps through the ground coffee, absorbing its oils and essences, solely under gravity, then passes through the bottom of the filter. The used coffee grounds are retained in the filter with the liquid falling (dripping) into a collecting vessel such as a carafe or pot.