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Since 1 April 2015, it has been possible in Japan to also apply for trade marks for sounds, colours, movements or holograms - not only for letters or images. While already more than 110 trade marks for colours, 65 for movements or 9 for holograms have been granted so far, on 1 March 2017, the first two trade marks for colours only were granted.
More information can be found on the website of the Ministry of Economy, Trade and Industry (Japanese only).