Suiter Swantz IP takes a look back at past inventions and inventors with our Patent of the Day.

On this day in 1898, Rudolf Diesel was granted U.S. Patent No. 608,845 for a INTERNAL COMBUSTION ENGINE.

An expert from the patent states:

My invention has reference to improvements in apparatus for regulating the fuel supply in slow-combustion motors, and in particular to internal-combustion engines adapted for carrying out the process described in my prior patent, No. 542,846,.dated July 16, 1895, which process consists in first compressing air or a mixture of air and neutral gas or vapor to a degree producing a temperature above the igniting-point of the fuel to be consumed, then gradually introducing the fuel for combustion into the compressed air while expanding against resistance sufficiently to prevent an essential increase of temperature and pressure, then discontinuing the supply of fuel and further expanding without transfer of heat.

In ordinary combustion engines the regulation of work done was performed either while the gas was at a constant pressure or, as in explosive engines, with the gas at constant volume.

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