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73117897 03 Mar 1977 | on 14 Aug 1984 | HEATING, VENTILATION AND AIR-CONDITIONING APPARATUS INVOLVING THE USE ... Class 011 Class 011 Environmental Control Instrument Products (lighting,heating,cooling,cooking) HEATING, VENTILATION AND AIR-CONDITIONING APPARATUS INVOLVING THE USE OF HEAT PIPES-NAMELY, AIR-TO-AIR HEAT EXCHANGERS FOR RECOVERY OF EXCESS THERMAL VALUES FROM HOT AIR EXHAUST DUCTS | | | ISO VENT Isothermics, Inc.
81036726 31 Dec 1969 | on 24 Aug 1982 | Class 011 Class 011 Environmental Control Instrument Products (lighting,heating,cooling,cooking) | | | THERMO-COIL Isothermics, Inc.
81035742 31 Dec 1969 | on 10 Aug 1982 | Class 011 Class 011 Environmental Control Instrument Products (lighting,heating,cooling,cooking) | | | ISOTHERMICS Isothermics, Inc.
81020830 31 Dec 1969 | on 09 Feb 1982 | Class 011 Class 011 Environmental Control Instrument Products (lighting,heating,cooling,cooking) | |