TAIPEI—HTC Corp. is working with Qualcomm Inc. on altering a component for the Taiwan company's flagship One and other phones to avoid a possible U.S. ban on imports of the devices, people familiar with the matter said.

A U.S. International Trade Commission judge last week issued a preliminary ruling that HTC infringed on two Nokia Corp. patents that enhance transmission and reception of phone calls. Nokia's filings with the commission said that the chip covered by the patents was made by Qualcomm.

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