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The suit names Sony Computer Entertainment America, Sony Pictures and Sony DADC and claims that products marketed under the Blu-ray name infringe on a patent Target owns for reflective-layer materials in optical discs. The patent addresses what Target called a need for specific types of silver-based alloys with the advantages (but not the price) of gold. According to the patent, the alloys are also more resistant to corrosion than pure silver.
Target does not specify in its suit whether it believes all of Sony's Blu-ray discs infringe on the Target patent or whether the suit applies to just a portion of the discs manufactured, notes CNET. The patent was filed in April of 2004 and granted in March of 2006.
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