SAN JOSE – Tessera Technologies’ patents are valid, but were not infringed, according to a preliminary ruling by the U.S. International Trade Commission.
 
Tessera said it would ask for a review of the decision.
 
The firm previously asked the ITC to stop product imports from several companies that it says violate three of its patents. The companies involved include Acer, Centon Electronics, Elpida Memory, Kingston Technology, Nanya Technology, Powerchip Semiconductor, ProMOS Technologies, Ramaxel Technology, Smart Modular Technologies and TwinMOS Technologies.
 

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