https://www.reuters.com/article/us-apple-qualcomm/apple-accuses-qualcomm-of-patent-infringement-in-countersuit-idUSKBN1DT1UU >Apple Inc on Wednesday filed a countersuit against Qualcomm Inc, alleging that Qualcomm's Snapdragon mobile phone chips that power a wide variety of Android-based devices infringe on Apple's patents, the latest development in a long-running dispute.