Fireplace hearth
Patent 4574773 Issued on March 11, 1986. Estimated Expiration Date: 
August 7, 2004. 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, 2004. 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 1213173 1727228 2740398 2819711 Space heater Fireplace system Fireplace having outside air supply Patent #: 4280473 InventorApplicationNo. 06/638588 filed on 08/07/1984US Classes:126/531, Hollow side walls in heat exchanger126/546, Vertically adjustable126/549, And auxiliary air flow adjuster126/550Smoke collecting hoodExaminersPrimary: Jones, LarryAttorney, Agent or FirmInternational ClassesF24B 1/188 (20060101)F24B 1/192 (20060101) F24B 1/00 (20060101) Foreign Application Priority Data1983-08-09 FRAbstractThe hearth includes a hood composed on the one hand of a first screen 5b extending obliquely from the top of the hearth opening towards the rear and on the other hand a second screen 19 extending from the rear wall of said hearth obliquely downwardly so that its free edge 19a lies above the opposed edge 5c of the first screen 5b.The opening of the hearth is closed by a guillotine-type door made by a glass panel 23 sliding in lateral slides 21, 22 invisible from the outside. The hearth further includes an intermediate chamber 10 enclosed by an outer envelop and constituting a heat exchanger.Field of SearchASH DISCHARGE AND COLLECTING | |
