A post-it note is a sticky note but it used to be the useful product’s name.
And even though 3M’s patent expired in 1997, the term “Post-it” and the original notes’ distinctive yellow color remain registered company trademarks!
Similar offerings manufactured by competitors usually have to go with “repositionable notes” (not so catchy, huh?).
Ouch! Got a band-aid?
I don’t think you’ll be sued by Johnson & Johnson’s (they’d have to sue lots of people) but “Band-Aid” is still a registered term and said registration is valid and legal.
However, since the term has become the generic one for an adhesive bandage in the United States, the registration may be challenged and removed if the challenger proves as a matter of fact that the alleged trademark has become generic.
Many will refer to it as table tennis but many others use the registered term “ping pong”.
The term was in wide use before British manufacturer J. Jaques & Son Ltd trademarked it in 1901. Later, Jaques would sell the rights to the famous Parker Brothers (yes, the creators of Monopoly and Clue/Cluedo!).
Unbelievable but true. “Super Hero” is a trademarked word.
Most dictionary definitions and common usages of the term are generic and not limited to the characters of any particular company or companies. Nevertheless, variations on the term “Super Hero” are jointly claimed by the two “giants of comic books“, DC Comics and Marvel Comics, as trademarks in the United States.
Both “Super Hero” and “Super Heroes” have been registered. Apparently, we can still use “superhero/es”.