Who invented the negative film?

Henry Fox Talbot Background Information: Henry Fox Talbot was an English inventor who had been working with paper soaked with silver chloride and fixed with a salt solution {AgCl} One day, in the year 1835, he produced his first paper negative in a camera (permanent). He creates permanent (positive) images by contact printing onto another sheet of paper. In 1839, Talbot announced a process of his own creation [which he called calotype]. This method alled him to create multiple copies of a positive image from only one (single) "negative". Talbot has outlined Photography as we know it now. As "a negative-positive process based on the light sensitive properties of silve salts." He is also the author of the demostrative photography book "The Pencil of Nature".