1 5 6 D O C U M E N T 8 4 R E F R I G E R A T O R   Index                                        P PD. Reichspatentamt Patentschrift Nr. 563 403. [1] Nowadays this refrigerator and its further developments are called the Einstein, or Einstein- Szilard, refrigerator. For the problems of its development, see Leo Szilard to Einstein, 12 April 1927 (Vol. 15, Doc. 512) as well as Dannen 1997, pp. 93–95. [2] The Lorentz force. [3] Albert Korodi, the engineer who was assisting them, attributed the idea expressed in claims 2 and 3 to Einstein (Dannen 1997, p. 94).