Xerox that. Copy that. Do you understand?
All the same. Xerox that is of my making. Copy that originated as radio slang for messages between control towers and/or aircraft.
Xerox maintains copyright of the name Xerox and prefers people call their copies, photocopies not xeroxes. When you go to your Hewlett Packard copy machine, you should not say "I'm going to be back soon after I xerox these papers". You should say "I'm going to be back soon after I copy these papers." Trademark hell for sure. Free advertisement but your brand disappears for everyone to use to advertise their brand.
The real topic of this post is when brand names become terms for a product is usually when there is a verb using the word.
Like, google "your question".
Taser - that smarts
Cellophane - Brits say clingfilm
Then there is using the brand name as the noun of the object
All of the brands above have their brand name or trademark copyright protected. So don't invent a product and plan to call it any of those things.
In my home, we call a popular object buttons. We lose our buttons. We ask each other if they know where the buttons are.
Some brands that have long become generic are
videotape - soon to be obsolete
Anyway, buttons is what we call our remote control. Now what do you call the small cardboard tube at the center of a toilet paper roll or the ends of a loaf of bread?