31 LOW TEMPERATURE PROCESS EQUIPMENT FOR CRYOGENIC PURIFICATION OF INDUSTRIAL GASES COMPRISING HEAT EXCHANGERS, PHASE SEPARATORS, EXPANSION VALVES AND RELATED COMPONENTS WITHIN AN INSULATED ENCLOSURE
Trademark Events
Mar 22, 1993
Expired Sec. 9
Dec 19, 1977
Registered - Sec. 8 (6-Yr) Accepted & Sec. 15 Ack.