On December 18, Opel registered the names “Calibra” and “Cascada” with the US Patent and Trademark Office.
While being a wholly-owned subsidiary of GM, the Opel brand isn't used in the US. So why is it registering names here? The most likely scenario is that by using Opel as the registrant, GM can hide its intention of using the names on upcoming Buick models. After all, Opel was reported to have registered the “Astra” name in the US prior to the Saturn Astra being rolled out.