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Then you'll be surprised to learn that these were once trademarks:

- Aspirin - Escalator - Yo-yo - Zipper

Ah, you are right. Though Aspirin is not like the others: Bayer lost its intellectual property in the Treaty of Versailles.

Zipper was a trademark?! I need a kleenex, and maybe a band-aid, and a ziploc to put the waste in :-(

don't forget to clean your ears out with a q-tip!