The trademark hydro was filed by Werner Briel, a national of the Federal Republic of Germany (the "Applicant"). The application was published for oppositions on October 4, 1998, and received one opposition filed on January 4, 1999 by Norsk Hydro ASA on (a) Identity of marks and Goods and Services, (b) Likelihood of confusion, (c) Unfair advantage and detriment to distinctiveness or repute, (d) Earlier sign & right to prohibit use of later TM under national law. and proceedings were handled in English, and the oppositon was dismissed by the Euorpean Union Intellectual Property Office with decision issued January 4, 1999
The application was filed in German, and German was also language of all opposition proceedings (English was selected as the second language).
Two renewals of the trademark were recorded, one on November 26, 2006, and the other one on December 13, 2016.