A patent-infringement action has been filed against Apple by Sentius International, which previously partnered with Apple on various products.

Sentius alleges that Apple’s spell-checking tool, which searches a device’s internal dictionary before highlighting any unfamiliar or incorrect words with a ‘red squiggly line’, before subsequently adding the word or words in question to the internal dictionary, violated Sentius’ US patents RE43,633 and 7,672,985.

The action cites a number of older Apple products, such as the iPhone 5, as well as various Apple apps, including Notes, Safari, and Messages.

In filing the action, Sentius is seeking damages, compensation, and a jury trial.

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