Here is why Apple is being sued by Immersion Corporation

Apple has been sued by Immersion Corporation for using its haptic feedback technology
Immersion Corporation, one of the leading developer of touch feedback technology has filed a patent infringement complaint against Apple with the US International Trade Commission.
According to the complaint, Immersion Corporation claims that Apple’s iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus and Apple Watch models infringe some of the patents related to haptic feedback systems.
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