Rambus (RMBS) - Get Report was down 8.2% in midmorning after hitting a 52-week low of $15.20. EBNews.com reported that a federal judge dismissed all but three patent infringement claims filed by the memory chipmaker against Infineon Technologies (IFX) .

The judge said Rambus failed to prove that patents for SDRAM and double-data-rate SDRAM technology had been violated, according to the report. The court is expected to decide later this week whether to continue the trial.