Today in 1935, US Patent 1995814 A was issued, an invention of Thomas J. Parker, for his “Steam Boiler.” There’s no Abstract, although in the description it includes this summary:

This invention relates to boilers and more particularly to electrically heated boilers for generating steam. The boiler herein shown and described is a miniature boiler particularly adapted for generating steam for cleansing and sterilizing fluid conduits, such as beer coils, but obviously the invention may be applied to various uses requiring steam under pressure.

One of the objects of the invention is to provide a boiler in which steam of desired pressure may be quickly and efficiently generated. Another object is to provide for heating the water in the boiler to generate steam by means of a novel and very efficient electric heating element mounted in direct heat contact on and surrounding a generating cylinder which is part of the circulatory system of the boiler.