Immersible water heater
Patent 4944286 Issued on July 31, 1990. Estimated Expiration Date: 
October 2, 2009. 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.
October 2, 2009. 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 410357 1200349 2695554 3186402 Heating unit for hot tubs and/or spa units Patent #: 4455997 InventorApplicationNo. 415761 filed on 10/02/1989US Classes:126/368.1, United to vessel containing the liquid126/73, Magazine126/377.1Heating fluid is a liquid or steamExaminersPrimary: Dority, Carroll B.Attorney, Agent or FirmForeign Patent References
International ClassF24B 009/00AbstractAn immersible water heater for burning solid fuel to heat water contained within hot tubs, tanks, and the like. The heater includes a vertically oriented combined air-fuel intake tube by which the fuel is gravity fed through an unobstructed opening at its lowermost end into a laterally placed combustion chamber. The combustion chamber terminates at its upper end into a chimney having a top opening above the top opening of the air-fuel intake tube to provide an air draft which cools fuel within the intake tube while, at the same time, providing oxygen for combustion within the combustion chamber. Brackets engaging the lip and sides of the tank or tub support the heater in spaced relationship to the sides and bottom of the container to prevent heat damage.Field of SearchMagazine | |
