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Class Information
Number: 454/1
Name: Ventilation > Chimney or stack
Description: Subject matter relating to a generally vertical, projecting, conduit section having an uppermost portion which opens to a surrounding environment, whereby air or products of combustion can flow between a ventilated space and the surrounding environment.

Sub-classes under this class:

Class Number Class Name Patents
454/3 Chimneytop or stacktop structure (e.g., cowl) 33
454/43 Having flue heater 21
454/42 Having internal air current guide 12
454/44 Having lining or sleeve 27
454/41 Having liquid drain 11
454/2 Vehicle 14

Patents under this class:

Patent Number Title Of Patent Date Issued
8490351 Pipe flashing protector Jul. 23, 2013
8202084 Method for preventing coagulation in exhaust pipe of boiler Jun. 19, 2012
8166710 High altitude structure for expelling a fluid stream through an annular space May. 1, 2012
7766731 Exhaust gas chimney Aug. 3, 2010
7757686 Vent assembly for combustion gases generated by an appliance Jul. 20, 2010
7077739 High velocity and high dilution exhaust system Jul. 18, 2006
6521155 Chimney-pipe and manufacture of same Feb. 18, 2003
5722235 Exhaust gas back pressure attenuator for truck exhaust stacks Mar. 3, 1998
5562155 Ventilated tank pagoda Oct. 8, 1996
5527216 Chimney Jun. 18, 1996
5425413 Method to hinder the formation and to break-up overhead atmospheric inversions, enhance ground level air circulation and improve urban air quality Jun. 20, 1995
5246397 Spacer rack for smoke detecton having separable sections Sep. 21, 1993
5160294 Spacer rack for smoke detection Nov. 3, 1992
5145458 Method and apparatus for lifting gas streams to a great elevation in the atmosphere Sep. 8, 1992
5125197 Interior cover for an air conditioner mounted in a wall Jun. 30, 1992
4993314 Convectively cooled hot gas exhaust structure to reduce infrared radiation Feb. 19, 1991
4947826 Chimney and fireplace construction Aug. 14, 1990
4924762 Solar powered air filter system May. 15, 1990
4865013 Self-adjusting telescoping concentric flue assembly Sep. 12, 1989
4800690 Stack system Jan. 31, 1989
4718156 Method of retrofitting an exhaust stack by incorporating a filter assembly Jan. 12, 1988
4637300 Filter assembly for an exhaust stack Jan. 20, 1987
4567700 Frame-supported membrane for chimney Feb. 4, 1986
4460128 Apparatus for dispersing flammable gases into the atmosphere Jul. 17, 1984
4448219 Heat-insulating pipe element May. 15, 1984
4437090 Apparatus for indicating creosote buildup in a chimney Mar. 13, 1984
4381717 Sectional smokestack May. 3, 1983
4320602 Stabilizing structures against oscillation Mar. 23, 1982
4279625 Electrostatic system for concentrating, propelling and collecting airborne particulates for industrial furnaces Jul. 21, 1981
4175538 Energy saving furnace construction Nov. 27, 1979
4166477 Discharge conduits of steam generators and the like Sep. 4, 1979
4158276 Multiple passage roof flashing assembly Jun. 19, 1979
4031631 Apparatus for reducing the opacity of the emissions from wood dryers Jun. 28, 1977
4018381 Apparatus for increasing the efficiency of heating systems for buildings Apr. 19, 1977
4012191 System for recovering heat from the exhaust gases of a heat generator Mar. 15, 1977
3984220 Chimney for purifying smoke of gases Oct. 5, 1976
3974756 Apparatus and method for field burning and fog or smog control Aug. 17, 1976
3960064 Tall stack construction Jun. 1, 1976

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