On May 9, 1876, German inventor Nikolaus Otto working with Gottlieb Daimler and Wilhelm Maybach started the world's first internal-combustion engine that efficiently burned fuel directly in a piston chamber. However, German courts did not hold his patent to cover all in-cylinder compression engines or even the four-stroke cycle, and after this decision, in-cylinder compression became universal and the principle of Otto's engine still is the general principle for engines today.