A U.S. appeals court will not reconsider rulings that chip designer Rambus Inc
The entire court will not review the case following its earlier rulings on May 13, according to the court records on Friday.
Rambus shares were down 2.58 percent at $13.99 in afternoon trading.
As well as patent litigation, the Sunnyvale, California company is locked in a $4 billion antitrust battle against memory chip makers Hynix Semiconductor Inc <000660.KS> and Micron Technology Inc
In the grand scheme of things, I don't see this as one of the more important news items affecting the ultimate resolution of the conflict between these companies, said B. Riley & Co analyst Mike Crawford, who owns Rambus shares.
Rambus says South Korea's Hynix and Idaho-based Micron colluded to fix prices of memory chips used in personal computers and prevent its technology from becoming widely used. It claims it lost billions of dollars in business.
Micron and Hynix argue Rambus' chip technology was plagued by technical problems and the company blames competitors for its own failure.
According to a court record, Rambus held at least two shred days as part of a strategy to get ready for litigation over its patents.
Rambus is evaluating its options following Friday's decision, spokeswoman Linda Ashmore told Reuters.
Much of Rambus' income has come from patent licensing and it has initiated litigation against a range of technology companies. Winning its legal battles makes it easier for Rambus to negotiate additional licensing arrangements.
(Reporting by Noel Randewich; editing by Matthew Lewis and Andre Grenon)