The English language is a voracious eater, consuming words and digesting them into whole new things. Sometimes words that used to be trademarked by companies pass into generic use - like escalator, thermos, and aspirin.
And sometimes words live in limbo: still trademarked, but used all the time as generic terms. These are all words (except one) that the United States Patent and Trademark Office lists as being registered and 'live.'
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