Electrical resistance fluid heating apparatus
Patent 4762980 Issued on August 9, 1988. Estimated Expiration Date: 
August 7, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 7, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1005754 1122423 1197552 3088017 3286078 Tank type engine heater Electrical heating element Electric water heating apparatus Patent #: 4185187 InventorAssigneeApplicationNo. 06/894269 filed on 08/07/1986US Classes:392/494, Block forms flow path338/305, Element extends in or through openings or grooves in frame or support392/492, Producing counterflow circulation392/497Immersion heater detailsExaminersPrimary: Bartis, AnthonyAttorney, Agent or FirmInternational ClassF24H 1/10 (20060101)AbstractApparatus for electrically heating a fluid medium includes a housing (18) having an inlet channel (54) and an outlet channel (60) communicating with a central passage (62). A heating cartridge (38) is resident in the central passage (62) and has a web (90) defining first and second series connected interior channels in communication respectively with the inlet and outlet channels (54, 60). A continuous electric resistance heating coil (94) extends successively through the interior channels and includes a mechanically stressed portion (94a) bridging the first and second interior channels. The bridging portion (94a) is electrically shunted by an electrically conductive member (96) to eliminate current flow therethrough to lessen the likelihood of burnout or failure of the stressed portion (94a). The heating coil (94) is controlled by temperature controller (22) having a temperature sensor (20) in the central passage (62) in juxtoposition with the shunted coil portion (94a) to reduce or eliminate the effects of heating coil radiant energy on the temperature sensor (20). The switching unit (28) of the temperature controller (22) is supported on the housing (18) in communication with the fluid inlet channel (54) to prevent overheating of the switching unit.Other References
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