Trademark terms turned generic, generic terms turned trademark.
A form of corporate censoring and language control.
Let's unzip the concept a little bit!
Eponym - noun
1. a name, esp a place name, derived from the name of a real or mythical person, as for example Constantinople from Constantine I
2. a language unit by which a person or thing is known; "his name really is George Washington"; "those are two names for the same thing"
3. the name of the person from which such a name is derived: in the Middle Ages, "Brutus" was thought to be the eponym of "Britain".
Stigler's law of eponymy
Ever notice how spell checkers capitalize certain words when using the correct written term for its common definition? Ever ask why?
Example: google - mathematical term; finite number. Type it today and the 'spell' checker automatically 'corrects' it as a Proper term.
What if google doesn't know everything?
Words from the past that have lost trademark or proper status:
Watch out for the trademark police. They got dictionaries. Many kinds of dictionaries.
Oh, and don't forget the library ones, too!Do the due diligence lest one gets a dirty letter in the mail.