Happy Saint Patrick's Day.

Some brands like to highlight their Irish roots around this time of year. But the use of the harp and the shamrock in a trade mark might not be allowed.  Article 6ter of the Paris Convention for the Protection of Industrial Property (1883) prohibits the use armorial bearings, flags, and other State emblems of the countries of the Union either as trademarks or as elements of trademarks. The Irish Free State became a member of the Paris Convention Union in its own right in 1925.  Countries in the Union add their emblems to a database maintained by the WIPO.  This a selection of some of those filed by Ireland. Using the harp of the shamrock in your trade mark (pretty much) anywhere in the world requires the permission of the Irish government.