1 Jan 1884 Jahr - Invention of the Chamberland Filter The porcelain filter was developed by Charles Chamberland, a French microbiologist who worked in collaboration with Louis Pasteur. It had pores the sizes of 100-1000 nm and was capable of removing any bacteria or other known cells at the time from a liquid suspension. This simple invention prompted the discovery of the first virus. Sources - Date accessed: https://rybicki.blog/tag/chamberland-filter/