Question: In what year was the patent filed for an electric liquid capacitor?

Is Charles Pollak (born Karol Pollak), the inventor of the first electrolytic capacitors, found out that the oxide layer on an aluminum anode remained stable in a neutral or alkaline electrolyte, even when the power was switched off. a good answer to this question?

pick from the following.
[1]. yes
[2]. no
[2].