Bengaluru/Taipei — Chip maker Qualcomm has escalated its patent battle with Apple, suing Foxconn and three other Taiwanese manufacturers that supply iPhone and iPad components for not paying royalties. Apple filed a lawsuit against Qualcomm in January, accusing it of overcharging for chips and refusing to pay about $1bn in rebates — a move that came days after the US government accused the chip maker of using anticompetitive tactics to maintain a monopoly over key semiconductors in mobile phones. Qualcomm has called Apple’s suit baseless and has said the iPhone maker was encouraging regulatory attacks on its business. On Wednesday, Qualcomm said in its complaint that Apple had advised the four contract manufacturers to withhold royalty payments and agreed to indemnify them against any damages resulting from the breach of their agreements with Qualcomm. It did not disclose the sum of the alleged unpaid royalties in the complaint which was filed in the US District Court for the Southe...
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