Viking Gas TITJUR Opinion of Advocate General Kokott delivered on 7 April 2011. Viking Gas A/S v Kosan Gas A/S. Reference for a preliminary ruling: Højesteret - Denmark. Trade marks - Directive 89/104/EEC - Articles 5 and 7 - Gas bottles protected as a three-dimensional mark - Placing on the market by an exclusive licensee - Business activity of a competitor of the licensee consisting in the refilling of those bottles. Case C-46/10.