European drug rivals Novartis and Novo Nordisk have jointly sued German drug maker Bayer over patent violation, in the US

Bayer confirmed the news that Novartis Vaccines and Diagnostics, the American division of Swiss pharma giant and Danish diabetes care company Novo Nordisc A/S have sued the company.

The two companies said that through production and distribution of the recombinant factor VIII product Kogenate, Bayer is infringing a compound patent issued in 2006. Essentially, the plaintiffs claim patent infringement and compensation.