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To: AK2004 who wrote (176851)	2/4/2004 10:52:00 PM
From: J_F_Shepard	Read Replies (1) \| Respond to of 186894

Einstein was a theoretical physicist.......such types don't usually do patentable work......You can't patent nature....

To: AK2004 who wrote (176851)	2/5/2004 4:05:13 PM
From: Robert O	Read Replies (1) \| Respond to of 186894

and yet Einstein did not have a single patent to his name Actually you are quite mistaken albert... read and learn: The Einstein Cycle While the Platen and Munters design is certainly the most popular single pressure cycle, it is not the only one. A U.S. patent by the famed Albert Einstein issued on November 11, 1930 discloses a single pressure thermally driven refrigeration cycle which uses butane, ammonia, and water. A literature search has provided only two brief references to this unique cycle (Alefeld, 1980 and Dannen, 1997). No analytical or experimental results are available in the open literature. ... Einstein Patent Review While the literature search only revealed a brief reference to this cycle (Alefeld, 1980), the reference does list several other U.K. patents by Einstein. Between 1927 and 1933, Albert Einstein and Leo Slizard published about seventeen patents mostly in Germany, but a few were published in the United Kingdom and one in the United States. One of the U.K. patents is particularly interesting since it expounds upon the single pressure cycle patented in the U.S. and studied here. The U.K. version was patented in 1928 on November 15 nearly two years before the U.S. version. It highlights four different single pressure refrigerators one of which appears in the U.S. Patent. Two of these use methyl-bromide as the refrigerant while the other two use butane. All four use ammonia and water for returning the refrigerant to the evaporator at a constant pressure. In the U.K. patent, the first two cycles utilize methyl-bromide as the refrigerant. Since methyl-bromide is heavier than the ammonia-water mixture, the fluid arrangement in the condenser/absorber is different with the ammonia-water being on top. Otherwise these two cycles operate similarly to the butane cycles, but offer alternative generator configurations. The U.S. patent contains only the third of the four cycles presented in the U.K. patent. The fourth cycle in the U.K. patent is different from the U.S. patent: the pre-cooler has been removed, and the ammonia-butane vapor mixture is bubbled into the weak ammonia-water mixture in the condenser rather than the weak ammonia-water mixture being sprayed into the ammonia-butane vapor. Because of this latter change, the weak ammonia-water mixture is not sprayed into the condenser but simply flows in.