DMG has used the successful, patent-protected, brand name "Mercedes" since September 1902. But there was still no characteristic trademark. Gottlieb Daimler's sons, Paul and Adolf, recalled that their father had once used a three-pointed star as a symbol.
Gottlieb Daimler was the Technical Director of Deutz Gasmotorenfabrik from 1872 to 1881. At the beginning of his period of employment, he had marked his house on a picture of Cologne and Deutz with a three-pointed star. He predicted to his wife that this star would one day rise gloriously above his production plant.
The DMG Board of Management seized on this prediction and in June 1909 registered both athree-pointed and four-pointed star as trademarks. Both logos were legally protected but it was the three-pointed star that was ultimately used and a three-dimensional star featured on the front radiator of vehicles from 1910 onwards.
The three-pointed star was also intended as a symbol for Daimler's principle of universal motorisation "on the ground, on water and in the air". Over the years it underwent a number of design amendments. In 1916 a circle was placed around the star, in which four small stars and the word Mercedes or the name of the DMG plants Untertürkheim and Berlin-Marienfelde were inserted.
In November 1921, DMG applied for protection of utility patents for new variants of its brand logo and registered a three-dimensional three-pointed star enclosed in a circle at the patent office – including a design for the radiator grille.