Brand names that have become common words
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Vaseline, Velcro, Mace and Styrofoam aren't generic? The fuck? I didn't even know those were trademarked names. Vaseline maybe, but the other three are common enough that I was sure they were generic.
Petroleum jelly, hook and loop, pepper spray, and polystyrene.
polystyrene-foam
Velcro brand doesn't want anyone to call the invention Velcro to protect the trademark: https://youtu.be/rRi8LptvFZY