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Another development in the lengthy legal battle between Apple (AAPL) and Qualcomm (QCOM)  transpired on Wednesday.

Apple filed a countersuit against Qualcomm in the U.S. District Court in San Diego accusing the chipmaker of infringing upon its patents.

In July, Qualcomm filed complaints in the U.S. District Court for the Southern District of California and with the United States International Trade Commission, seeking the ban on iPhone imports. At the time Qualcomm argued that Apple had allegedly infringed on six of its patents that improve iPhone performance and battery life, and wants it to pay damages.

But in this latest countersuit,  first reported by Reuters, Apple alleges that it holds at least eight battery life patents that Qualcomm has violated, and argues that Qualcomm's Snapdragon 800 and 820 processors infringe on those patents.

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"Apple began seeking those patents years before Qualcomm began seeking the patents it asserts against Apple in this case," the iPhone maker's complaint said. Apple is seeking unspecified damages from Qualcomm.

Shares of both Apple and Qualcomm were sinking lower during early morning trading on Wednesday. 

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