granted in fluid contacting apparatus (including cryogenic distillation). In recognition of the cutting-edge position of the ECC patents, the Patent Office has created a new cross.... 4,357,153 Internally Heat Pumped Single Pressure Distillative Separations. November 2, 1982. 4,357,308 Dual Temperature Dual Alkali Desulfurization. November 2, 1982. 4,402,795 Reverse... Absorption Heat Pump Augmented Distillation Process. September 6, 1983. 4,433,989 Air Separation with Medium Pressure Enrichment. February 28, 1984. 4,454,724 Aqueous Absorbent...