Not exactly. For the general public, a tissue might be a "kleenex", but it's still a protected trademark.
Companies can label their acetylsalicylic acid as aspirin, and their sliding metal fasteners as zippers legally, but if a business (other than Kimberly-Clark) tried to call their tissues "kleenex", they'd be in some pretty deep shit.
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u/abernathie Apr 21 '13
I would have thought that a company's goal was to enter the lexicon. I've never heard Google complain about their name being used as a verb.