Oblon, Fisher, Spivak, McClelland & Maier
Air liquefaction and separation process and equipment
 A method and equipment are disclosed herein which liquefy and separate air through the use of a multiple rectifying tower system comprising a high pressure tower and a low pressure tower. The rectifying regions of the high pressure tower and the low pressure tower are divided into an equal number (at least two) of segments and gases at the tops of the respective segments of the high pressure tower are permitted to exchange heat with circulating liquids or liquid oxygen at the bottoms of the respective segments of the low pressure tower and to evaporate the circulating liquids or the liquid oxygen. The gases are then condensed to provide a circulating liquid for the low pressure tower. 
Kabushiki Kaisha Kobe Seiko Sho
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Takayoshi Hidekazu Shoichi
Asami Sonoi Tamura