When did paul nipkow invent the television?

Paul Nipkow invented an electromechanical television on December 24, 1883, and a patent on it was granted in 1885. It was further developed in England during the period around 1920, and the first Broadcast Television pictures displayed publicly in England in 1925 used his system. It was not as practical as the electronic scanning used today, however, and went out of use.