The license was purchased by the Delco Company, which was taken over by the General Motors Corporation. Charles Kettering at General Motors modified the self-starter, and made it practical. It was first installed on Cadillac cars in 1911. By 1920, nearly every car had a self-starter.
The self-starter is a necessity for internal-combustion engines, since they cannot start themselves. This is due to the fact that Otto cycle requires the pistons already be in motion before the ignition phase of the cycle. This means that the engine must be started in motion by an outside force before it can power itself. Originally a hand crank was used to start the engine, but this was inconvenient and rather hard work to crank the engine up to speed. For the self-starter, an electric motor, called a starter motor or sometimes just plain starter is used in place of the hand crank to start the engine.