31 AIR AND GAS SEPARATION PURIFICATION AND LIQUEFACTION PLANTS COMPRISING AIR COMPRESSORS, EXPANSION TURBINES, HEAT EXCHANGERS, FRACTIONATION COLUMNS, AND GAS ABSORPTION UNITS
Trademark Events
Jan 2, 1995
Expired Sec. 9
Feb 19, 1980
Registered - Sec. 8 (6-Yr) Accepted & Sec. 15 Ack.