Vacuum cleaners working on the cyclone principle became popular in the 1990s, although some companies (notably Filter Queen) have been making similarly-designed vacuum cleaners since at least the 1960s. Modern cyclonic cleaners were adapted from industrial cyclonic separators by James Dyson in 1985. He launched his cyclone cleaner first in Japan in the 1980s at a cost of about US$1,800 and later the Dyson DC01 upright in the UK in 1995 for £200. It was expected that people would not buy a vacuum cleaner at twice the price of a normal cleaner, but it later became the most popular cleaner in the UK.