To get more revenues, in 1878 he began to work on new patents. First, he concentrated all his efforts on creating a reliable gas two-stroke engine. Benz finished his two-stroke engine on December 31, 1878, New Year's Eve, and was granted a patent for it in 1879. Karl Benz showed his real genius, however, through his successive inventions registered while designing what would become the production standard for his two-stroke engine. Benz soo...