RIM (Research in Motion) has sued Samsung Telecommunications America, claiming that Samsung's BlackJack smartphone violates the BlackBerry trademark.

RIM is asking that Samsung be stopped from selling the BlackJack and Black Carbon mobile phones and is seeking unspecified damages, according to court filings.

"Samsung is misleading the public into falsely believing that Samsung's goods and services are connected with RIM's business," the filing states.

The $450 (£230) BlackJack phone was introduced last month to the US market, where it is sold exclusively by Cingular Wireless, while Black Carbon is an ultra-thin phone sold directly by Samsung.

A Samsung spokesman declined to comment on the matter. "Samsung is not going to comment on pending litigation," he said.