May 23 (Reuters) - Nvidia Corp NVDA.O
* On March 31, A German patent court acknowledged receipt of nullity actions filed by co challenging validity of EP1428225 and DE 1020066043668
* Polaris Innovations Limited has not yet responded to actions
* On May 9, co filed motion to stay action pending final resolution of ipr of U.S. Patents nos. 7,886,122; 7,124,325; and 8,161,344 Source text for Eikon: Further company coverage: NVDA.O