LONDON, July 2 (Reuters) - London's High Court on Tuesday ruled that one of Moderna's patents relating to technology key to the development of vaccines for COVID-19 was invalid, but that another was valid and had been infringed by Pfizer and BioNTech's rival vaccine.

Pfizer and its German partner BioNTech sued Moderna at London's High Court in September 2022, seeking to revoke two patents held by Moderna, which hit back days later alleging its patents had been infringed.

The High Court ruled that one of Moderna's two patents relating to messenger RNA (mRNA) technology was invalid, but that another similar patent was valid and that Pfizer and BioNTech's Comirnaty vaccine had infringed it.

Tuesday's ruling is the latest in a global legal battle, with parallel proceedings in Germany, the Netherlands, Belgium and the United States, as well as in Ireland and at the European Patent Office. (Reporting by Sam Tobin; Editing by Sachin Ravikumar)