Supercapacitor
Since capacitors' energy content increases with the square of the voltage, researchers were looking for a way to increase the electrolyte's breakdown voltage. In 1994 using the anode of a 200V high voltage tantalum electrolytic capacitor, David A. Evans developed an "Electrolytic-Hybrid Electrochemical Capacitor". These capacitors combine features of electrolytic and electrochemical capacitors. They combine the high dielectric strength of an anode from an electrolytic capacitor with the high capacitance of a pseudocapacitive metal oxide (ruthenium (IV) oxide) cathode from an electrochemical capacitor, yielding a hybrid electrochemical capacitor. Evans' capacitors, coined Capattery, had an energy content about a factor of 5 higher than a comparable tantalum electrolytic capacitor of the same size. Their high costs limited them to specific military applications.
János Csonka
János Csonka (1852 in Szeged – 1939 in Budapest) was a Hungarian engineer, the co-inventor of the carburetor for the stationary engine with Donát Bánki, patented on 13 February 1893.
Csonka, self-educated in many fields, had no university degree, but became one of the greatest figures of Hungarian engineering industry, and with the carburetor he has heavily contributed to technical development in the world. He studied the Lenoir motor in Paris in 1874 and there he recognized the prospects of the internal combustion engine.
He became head of the training workshop at the Technical University of Budapest at the age of 25 where he employed skilled workers at his own expense, which allowed him to use the workshop for his experiments.
Csonka retired at the age of 73 and filed his last patent application at the age of 84.