US PATENT SUBCLASS 110 / 179
.~ Fluid screens
Current as of: June, 1999
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DEFINITION
Classification: 110/179
(under subclass 173) Devices for preventing the heat, gases, or flames from passing out of the furnace when the door is opened either by a spray of steam, air, or water or by causing air to be drawn into the door or having means to draw the gases through a bypass when the door is opened. These devices also serve to prevent the cold outside air from cooling the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
163, for devices for preventing the chilling of the fire and boiler-flues.
SEE OR SEARCH CLASS
48, Gas: Heating and Illuminating,
87, for cupola screens.
