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Class Information
Number: 237/80
Name: Heating systems > Antifreezing devices
Description: Devices for preventing freezing in heating conduits or other hollow heaters or for thawing out heating conduits not provided for in other classes.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8555574 Pipe insulation system Oct. 15, 2013
8333330 Systems and methods for controlling temperature and pressure of fluids Dec. 18, 2012
8117998 Hot water supplying system Feb. 21, 2012
7334740 Method and apparatus for melting snow and ice Feb. 26, 2008
7314039 Method of controlling operation of a liquid-fuel combustion appliance Jan. 1, 2008
6761135 Multipurpose assembly Jul. 13, 2004
6622930 Freeze protection for hot water systems Sep. 23, 2003
6536458 Device for heating a tap Mar. 25, 2003
6196246 Freeze-resistant plumbing system in combination with a backflow preventer Mar. 6, 2001
6089221 Space heater Jul. 18, 2000
5900178 Device for melting snow or ice May. 4, 1999
5730168 Pipe burst protection pressure relief apparatus for plumbing fixtures Mar. 24, 1998
5692535 Icing preventer with temperature adjustment washer Dec. 2, 1997
5643482 Snow melt control system Jul. 1, 1997
5553636 Watering through fill valve control Sep. 10, 1996
5538031 Recreational vehicle winterizing device Jul. 23, 1996
5488968 Fluidizing system and method Feb. 6, 1996
5361795 Furnace waste water freeze protection method Nov. 8, 1994
5287876 Water piping system Feb. 22, 1994
5240179 Anti-freeze assist apparatus Aug. 31, 1993
5220937 Freeze buster Jun. 22, 1993
5123262 Cold transfer method and device Jun. 23, 1992
5113892 Freeze control and drain valve May. 19, 1992
5113891 Water freeze guard valve May. 19, 1992
4967780 Anti-freezing device Nov. 6, 1990
4932429 Screw stopper including anti-freeze device used for water pipe valve Jun. 12, 1990
4928754 Heat exchanging apparatus May. 29, 1990
4883082 Temperature-responsive valve Nov. 28, 1989
4867376 Air control system Sep. 19, 1989
4852601 Thermally-activated drip valve Aug. 1, 1989
4815491 Freeze protection device Mar. 28, 1989
4809727 Thermally-activated drip valve Mar. 7, 1989
4784173 Water freeze prevention valve Nov. 15, 1988
4766925 Dump valve assembly Aug. 30, 1988
4763682 Thermally responsive valve activating assembly Aug. 16, 1988
4757718 De-icer for a transducer assembly Jul. 19, 1988
4730637 Fluid loss, damage prevention and control system Mar. 15, 1988
4672990 System for freeze protection of pipes Jun. 16, 1987
4657038 Apparatus for preventing water pipe freeze-up Apr. 14, 1987
4649959 Antiburst system for water lines Mar. 17, 1987
4638828 Water temperature actuated drip valve Jan. 27, 1987
4541448 Freeze protection valve with metal to plastic fitting design Sep. 17, 1985
4523605 Freeze preventing valve Jun. 18, 1985
4522219 Freeze preventing valve Jun. 11, 1985
4520836 Freezeproof valve assembly Jun. 4, 1985
4508132 Temperature controlled valve mechanism and method Apr. 2, 1985
4484594 Freeze guard valve Nov. 27, 1984
4469118 Icing preventor Sep. 4, 1984
4461345 Heat-augmented heat exchanger system Jul. 24, 1984
4459815 Air conditioner Jul. 17, 1984

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