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Class Information
Number: 392/502
Name: Electric resistance heating devices > Heating devices (class 219 subclass 200) > Immersion heater details > Having positive temperature coefficient
Description: Subject matter wherein the resistance heating element of the immersion heater increases its resistance as the temperature increases.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8478117 Heating device and heat exchanger Jul. 2, 2013
8301021 Heating device for fuel Oct. 30, 2012
8231779 Filtering device for fluids, in particular for fuel Jul. 31, 2012
8084721 Electrical heating apparatus, method of manufacturing heat generator unit and pressing jig for use in manufacturing thereof Dec. 27, 2011
7676144 Heat-generating element of a heating device Mar. 9, 2010
7667166 Heat-generating element of a heating device Feb. 23, 2010
7332693 Tube and method for bracing functional elements in the same Feb. 19, 2008
7035533 Electrical resistance heating element with a honeycomb body Apr. 25, 2006
6501907 Heating facility for a motor vehicle component to be heated Dec. 31, 2002
6493508 Fuel filter Dec. 10, 2002
6449429 Indirectly heating type of electric boiler apparatus Sep. 10, 2002
6442341 Simple-type fluid heating tube structural arrangement Aug. 27, 2002
6418277 Immersible PTC heating device Jul. 9, 2002
6402943 Diesel filter system Jun. 11, 2002
6054692 Heating device, heat storing type heat generating body and protective sheet for the heating device Apr. 25, 2000
5828810 Positive temperature coefficient bar shaped immersion heater Oct. 27, 1998
5598502 PTC heater for use in liquid with close electrical and thermal coupling between electrode plates and thermistors Jan. 28, 1997
5568587 Electronic immersion aquarium heater with spring biased NTC sensor Oct. 22, 1996
5278940 Device utilizing a PTC resistor for electrically heating flowing liquid or gaseous media Jan. 11, 1994
5271087 Dental handpiece for heating media utilizing a PTC resistor and sintered metal components Dec. 14, 1993
5206476 Supplementary automobile duct heater Apr. 27, 1993
5125070 PTC heater assembly with securely positioned PTC resistors Jun. 23, 1992
5117089 Structural support for hermetic terminal assembly heater apparatus May. 26, 1992
5117482 Porous ceramic body electrical resistance fluid heater May. 26, 1992
5058197 Heater apparatus for fluid medium in a hermetically sealed chamber Oct. 15, 1991
4899032 Electric heating element utilizing ceramic PTC resistors for heating flooring media Feb. 6, 1990
4886956 Method of electroding PTC heaters Dec. 12, 1989
4870249 Electric fuel heating device Sep. 26, 1989
4864103 Canister cover heater for automotive vapor canister Sep. 5, 1989
4861966 Method and apparatus for electrically heating diesel fuel utilizing a PTC polymer heating element Aug. 29, 1989
4822980 PTC heater device Apr. 18, 1989
4818842 Diesel fuel heater Apr. 4, 1989
4808793 Tankless electric water heater with instantaneous hot water output Feb. 28, 1989
4797534 PTC thermistor heating device Jan. 10, 1989
4794226 Self-regulating porous heater device Dec. 27, 1988
4759189 Self-limiting thermal fluid displacement actuator Jul. 26, 1988
4737616 Multi-function portable electric room heater having a removable heating cartridge Apr. 12, 1988
4721846 Canister heater with PTC wafer Jan. 26, 1988
4717813 Multipassage, multiphase electrical heater Jan. 5, 1988
4713524 PTC fuel heater for heating alcohol fuel Dec. 15, 1987
4697069 Tubular heater with an overload safety means Sep. 29, 1987
4684786 Electrically heated fuel pick-up assembly for vehicle fuel tanks Aug. 4, 1987
4661687 Method and apparatus for converting a fluid tracing system into an electrical tracing system Apr. 28, 1987
RE32396 PTC heater construction Apr. 14, 1987
4645908 Residential heating, cooling and energy management system Feb. 24, 1987
4626666 Self-regulating electric heater Dec. 2, 1986
4604516 Cascaded arrangement for electrically heating fluids to high temperature Aug. 5, 1986
4585924 Self-contained electric diesel engine fuel filter assembly heater Apr. 29, 1986
4570046 Method of processing PTC heater Feb. 11, 1986
4447706 Nozzle assembly with integrated PTC heater for prewarming fuel oil May. 8, 1984

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