Reminds me of the dark ages, when Xerox was so dominant in the copier market that people used their brand as a noun and a verb. They were threatened with loss of their trademark, because it had become so generic. So they had a massive publicity campaign, asking people to say "copy" instead of "xerox". Is this a uniquely US thing? In the UK, people always say "hoover" instead of "vacuum".
In France many trademarks became generic names: Frigidaire and its abbreviated form frigo is the standard name for a refrigerator (nobody ever says "réfrigérateur"). Kleenex is the standard word meaning "paper handkerchief". Sopalin is the standard word for "roll of paper towels". Many automotive parts are called from a brand name too : "Delco" is the only name an igniter is ever called; a flexible black tube is alwa…
- bic for a ball pen
- scotch for duct tape
- kalxon for a car honk
- rubalise for the white-and-red tape used in streets
- mobylette for that very specific old style scooter
- pédalo for the floating thingy on the beaches with pedals
As for cellophane I always called it "film plastique" or just "plastique", but this varies a lot from region to region and family to family.
As for Durit, it's actually a bit more interesting as the brand was genericised to "durite". It's so prevalent that we have expressions using it like "péter une durite" as a way to say "going crazy".