Over time, the term became generic and is now an example of a genericized trademark.
Think about trademarks that have become generic and have lost their ability to maintain trademark status.
A lot of comedy has become more generic.
Kustom Koozies asserted in 2005 that the trademark had become generic.
In the meantime, solo shows that resemble group shows are becoming generic.
Just as the decor has become generic, so have some of the kitchen's efforts, which suffer from inconsistency as well.
In certain cases, the name of widely popular products became generic, and therefore could not be protected afterwards.
The term 'Tego film' remains in use around plywood manufacturing today, although it has become generic.
The manufacture has since spread around the world and the name has become generic.
And boutiques are morphing into minichains, at the risk of becoming generic themselves.