IC 011. US 013 021 023 031 034. G & S: COMPRESSED AIR/GAS DRYERS, NAMELY, DRYERS USED FOR THE REMOVAL OF WATER VAPOR FROM COMPRESSED AIR AND GASES; DRYERS USED FOR THE REMOVAL OF SOLID, LIQUID AND VAPOR CONTAMINANTS FROM COMPRESSED AIR AND GASES; AIR FILTERS, HEPA FILTERS AND ULPA FILTERS FOR RESIDENTIAL, COMMERCIAL AND INDUSTRIAL HEATING, VENTILATION AND AIR CONDITIONING SYSTEMS; FAN FILTER UNITS, NAMELY, SELF-CONTAINED MOTORIZED UNITS WITH A HEPA OR ULPA FILTER INCORPORATED INTO A VENTILATION SYSTEM; NEGATIVE PRESSURE SYSTEMS, NAMELY, AN AIR FLOW CONTAINMENT WITH A HEPA OR ULPA FILTER FOR USE, NAMELY, IN HEATING, VENTILATION, AND AIR CONDITIONING SYSTEMS IN LABORATORY ENVIRONMENTS WITHIN THE ACADEMIC BIOTECH, PHARMACEUTICAL, HEALTH CARE, RESEARCH AND DEVELOPMENT AND INDUSTRIAL ENVIRONMENTS; DUST COLLECTOR SYSTEMS, NAMELY, AN AIR SYSTEM UNIT WITH A FILTER AND A HOUSING USED PRIMARILY IN MANUFACTURING, POWER GENERATION AND UTILITIES; AND LIQUID FILTER CARTRIDGES USED PRIMARILY TO TRAP PARTICLES IN LIQUID STREAMS IN RESIDENTIAL, INDUSTRIAL AND COMMERCIAL HEATING, VENTILATION, AND AIR CONDITIONING APPLICATIONS; INDUSTRIAL COOLERS/CHILLERS, NAMELY, A SELF-CONTAINED UNIT USING REFRIGERATION CYCLES TO PROVIDE A CONTINUAL STREAM OF COOLANT IN INDUSTRIAL, MANUFACTURING AND LABORATORY ENVIRONMENTS. FIRST USE: 19880101. FIRST USE IN COMMERCE: 19940516