Patent US3987778A successfully refreshed from Google Patents.
US3987778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auxiliary fireplace structure
Assignee: Individual
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Filing: 1976-01-08
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Granted: 1976-10-26
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Expires: 1996-01-08
Abstract
Abstract A portable fireplace for placement in front of an existing fireplace opening and having a series of exhaust ducts extending in an upwardly inclined direction between a firebox and the fireplace opening. Fireplace side walls, top wall and front wall provide heat radiating surfaces providing an efficient space heater. Horizontal and upright air passageways are inwardly defined by firebox partitions which transfer heat to air flowing in a convective manner through the passageways. The upright air passageway is enlarged adjacent its upper end to subject air moving therethrough to heated duct surfaces. A hood serves as an air deflector returning air in a horizontal direction into the room.
Inventors
- 👤 Michael D. Brik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:29
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/02; F24B5/00; F24B5/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A portable auxiliary fireplace for placement in front of a room wall opening, said portable auxiliary fireplace comprising, a walled structure including a front wall, side walls, a back wall and an upper wall of metal construction, horizontal and upright partitions within said structure partially defining a firebox on one side and horizontal and upright air passageways on their opposite sides through which a heated flow of air moves, a series of inclined tubular ducts extending upwardly and rearwardly from said upright partition across said upright passageway and through said back wall for discharge of combustion products into the wall opening, and said side walls, front wall and upper wall serving as heat radiating surfaces for heating of the room while said inclined ducts additionally heat air flowing through said passageways.
Claim 2
Dependent Claim
131 words
A portable auxiliary fireplace for placement in front of a room wall opening, said portable auxiliary fireplace comprising, a walled structure including a front wall, side walls, a back wall and an upper wall of metal construction, horizontal and upright partitions within said structure partially defining a firebox on one side and horizontal and upright air passageways on their opposite sides through which a heated flow of air moves, a series of inclined tubular ducts extending upwardly and rearwardly from said upright partition across said upright passageway and through said back wall for discharge of combustion products into the wall opening, and said side walls, front wall and upper wall serving as heat radiating surfaces for heating of the room while said inclined ducts additionally heat air flowing through said passageways.
Claim 3
Dependent Claim
31 words
The auxiliary fireplace claimed in claim 1 wherein said back wall terminates upwardly in a forwardly curved hood directing heated passageway air back into the room in a substantially horizontal direction.
Claim 4
Dependent Claim
67 words
The auxiliary fireplace claimed in claim 1 wherein said upright partition is offset inwardly from the fireplace back wall and includes a forwardly inclined upper portion partially defining an enlarged upper portion of said upright air passageway, each of said tubular ducts having a major segment disposed across said enlarged portion of the upright air passageway for the transfer of heat to air passing between the ducts.
References Cited (Backward Citations)
US2789554A
Cited
US3220400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |