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Class Information
Number: 237/50
Name: Heating systems > Air
Description: Heating systems in which air is heated directly by a combustion apparatus and distributed.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7481650 |
Direct gas-fired burner assembly with two-stage combustion |
Jan. 27, 2009 |
| 6729551 |
Fireplace make-up air heat exchange system |
May. 4, 2004 |
| 6550687 |
Heat exchange system |
Apr. 22, 2003 |
| 6543698 |
Fireplace make-up air heat exchange system |
Apr. 8, 2003 |
| 6508409 |
Heat producing system for a building |
Jan. 21, 2003 |
| 6047695 |
Fireplace heat exchanger |
Apr. 11, 2000 |
| 5855320 |
Combined furnace and heat recovery system |
Jan. 5, 1999 |
| 5139011 |
Unvented gas-fired heater |
Aug. 18, 1992 |
| 5092518 |
Hot-air type heater |
Mar. 3, 1992 |
| 5038751 |
Direct fired unit heater |
Aug. 13, 1991 |
| 4981263 |
Paint booth thermal reclamation system for space heating |
Jan. 1, 1991 |
| 4928667 |
Gas fire heating unit |
May. 29, 1990 |
| 4828170 |
Heating apparatus for heating confined spaces, particularly apparatus for heating the passenger compartments of an automotive vehicle and the like |
May. 9, 1989 |
| 4798327 |
Convection lock-vent |
Jan. 17, 1989 |
| 4766878 |
Far-infrared radiating system |
Aug. 30, 1988 |
| 4750673 |
Fan apparatus for heating and circulating air |
Jun. 14, 1988 |
| 4741391 |
Method and apparatus for recovering of transmitted heat |
May. 3, 1988 |
| 4669656 |
Heating system |
Jun. 2, 1987 |
| 4606399 |
Heat recovery system with combustion gas accelerator |
Aug. 19, 1986 |
| 4572429 |
Method and means for conserving energy requirements and improving working conditions of a sock finishing factory |
Feb. 25, 1986 |
| 4561421 |
High efficiency furnace |
Dec. 31, 1985 |
| 4537117 |
Fresh air device for mobile home or other dwelling |
Aug. 27, 1985 |
| 4526319 |
Local heating installation |
Jul. 2, 1985 |
| 4520740 |
Combustion and heating equipment |
Jun. 4, 1985 |
| 4504011 |
Air conditioning system for poultry houses |
Mar. 12, 1985 |
| 4473060 |
Energy efficient heating system |
Sep. 25, 1984 |
| 4440342 |
Heat dispersing thermal barrier |
Apr. 3, 1984 |
| 4412652 |
Economizer for building heating systems |
Nov. 1, 1983 |
| 4403732 |
Energy saving heat recycling system |
Sep. 13, 1983 |
| 4351476 |
Air filtering system and method of operation |
Sep. 28, 1982 |
| 4324359 |
Heat reclaiming system |
Apr. 13, 1982 |
| 4194558 |
Waste heat recovery device |
Mar. 25, 1980 |
| 4138985 |
Portable heating and cooking stove |
Feb. 13, 1979 |
| 4103598 |
Wall structure |
Aug. 1, 1978 |
| 4103826 |
Heat exchanger for a freestanding heating unit |
Aug. 1, 1978 |
| 3997108 |
Automatic air flow control |
Dec. 14, 1976 |
| 3949522 |
Greenhouse |
Apr. 13, 1976 |
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