Rambus scored a key victory Wednesday in its nearly decade-old fight with memory chip makers when a jury found the company did not engage in monopolistic behavior by patenting technologies that eventually became standard in memory chips. Shares of the Los Altos-based company shot up $7.25, or nearly 39 percent, to $25.86 during regular-session trading on the news. They gained another $1.02 to $26.88 after hours.

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