LUXEMBOURG/BRUSSELS: Arcelor, the world's second-largest steel maker, has decided to take legal action in the United States against its unsolicited bidder Mittal Steel, alleging patent infringement.   
 
โ€œWe decided on Wednesday afternoon to take Mittal to court over patent infringement,โ€ Arcelor spokesman Jean Lasar said on Thursday, confirming a report in the Luxembourg press.   
 
A spokesman for Mittal declined to comment, saying the company had not yet seen Arcelor's statement.
 
Lasar said the action concerned so-called Usibor steel technology, used in the automobile industry.   
 
โ€œWe are defending our intellectual property rights,โ€ Lasar said, adding that his company's legal challenge was unrelated to Mittal's takeover bid.
 
โ€œWe would have done the same if it had been another competitor,โ€ Lasar added.
 
Arcelor and Mittal report first-quarter results on Friday.