A brand name for a new kind of staircase
When the moving staircase was first marketed, “Escalator” was a protected name, not the general name of the machine. Inventor Charles Seeberger coined the word and licensed his design to the Otis Elevator Company, which used Escalator as a trademark. The word joined the idea of a stair with “elevator,” giving the public a memorable label for a machine that carried people between floors without asking them to climb.
How the name became the thing
As moving staircases spread through public buildings and shops, people increasingly used “escalator” to mean any such machine, including ones made by other companies. That shift matters in trademark law: a trademark identifies a particular source, while an ordinary noun names a whole category. If buyers and sellers treat a brand name as the category’s name, the mark can become generic and lose its special legal protection.
Otis could claim ownership of the name, but it could not easily keep everyday speech within trademark boundaries. By the time the word was widely understood as the machine itself—not just an Otis product—the distinction had largely dissolved. In 1950, the trademark was ruled generic in the United States.
The tradeoff of a name everyone knows
The change made “escalator” freely usable as the name of the device, rather than a label reserved for one company’s machines. It is a striking commercial reversal: a name can become so successful at identifying a new invention that people stop hearing it as a brand at all.
