What was the name of the refrigerator co-invented by Albert Einstein and Leo Szilard?

The refrigerator co-invented by Albert Einstein and Leo Szilard was called the Einstein refrigerator, also known as the Einstein–Szilard refrigerator. It was an absorption refrigerator designed to operate without moving parts and to use heat as its energy input.

Einstein and Szilard worked on the design during the 1920s after reports of a refrigerator accident raised concerns about toxic refrigerant leaks. Their concept used a sealed system involving fluids such as water, ammonia, and butane. Einstein's experience as a former patent-office examiner helped with the patent work, while Szilard contributed heavily to the engineering and inventive development.

The pair filed related patents in several countries, and a U.S. patent was issued on November 11, 1930. The refrigerator was reliable in principle but less efficient than competing designs and never became a commercial success. The arrival of safer Freon-based systems and the Great Depression further reduced its prospects.