GM Trademarks Name for Possible Buick Convertible By Jason Siu Jan 06 2014 Share this Article Tweet General Motors has registered the Cascada and Calibra names with the U.S. Patent and Trademark Office, hinting that the Buick lineup is about to get new additions. Continue Reading... Filed under: American Buick Convertibles Coupes Featured Articles Luxury Cars OpelTags: Buick, buick regal, calibra, cascada, general motors, GM, opel calibra, opel cascada