Actually, "champagne" is a global trademark, and using it for an electronic device would be a violation of its global trademark. It's no different from "Coca Cola", "Pepsi" or "McDonalds" in that regard.
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You can trademark a word used to describe a specific type of sparkling wine made in a specific region of France though. You seem to think that the color came before the beverage, when the color was actually named AFTER the beverage.