US4886047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fireplace heat efficiency device
Assignee: Individual
•
Filing: 1988-10-07
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Granted: 1989-12-12
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Expires: 2008-10-07
Abstract
Abstract A simple, low-cost, low-maintenance device to be added or built in to a fireplace, which, by convective and radiative means, increases the amount of heat transferred to living areas, is architecturally unobstrusive in design and silent in function.
Inventors
- 👤 Paul R. Bonin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:02
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/191; F24B1/195; F24B1/1957
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
130 words
A fireplace heat efficiency device for use in a fireplace having a firebox floor, a fuel grate, a heat source, and a rear wall, said device comprising: a substantially vertical surface, said substantially vertical surface being substantially parallel to said rear wall; a shield attached to said substantially vertical surface, said shield being substantially parallel to said substantially vertical surface; a passageway between said substantially vertical surface and said shield, said passageway providing substantially unobstructed flow of air upwardly between said shield and said substantially vertical surface; and a substantially horizontal surface supportively attached to said substantially vertical surface by attachment means, said substantially horizontal surface supported above said shield and said firebox floor by said substantially vertical surface, said substantially horizontal surface being directly exposed to said heat source.
Claim 2
Dependent Claim
130 words
A fireplace heat efficiency device for use in a fireplace having a firebox floor, a fuel grate, a heat source, and a rear wall, said device comprising: a substantially vertical surface, said substantially vertical surface being substantially parallel to said rear wall; a shield attached to said substantially vertical surface, said shield being substantially parallel to said substantially vertical surface; a passageway between said substantially vertical surface and said shield, said passageway providing substantially unobstructed flow of air upwardly between said shield and said substantially vertical surface; and a substantially horizontal surface supportively attached to said substantially vertical surface by attachment means, said substantially horizontal surface supported above said shield and said firebox floor by said substantially vertical surface, said substantially horizontal surface being directly exposed to said heat source.
Claim 3
Dependent Claim
20 words
The device of claim 1, wherein said substantially vertical surface is supported by support means attached to said rear wall.
Claim 4
Dependent Claim
20 words
The device of claim 1, wherein said substantially vertical surface is supported by support means attached to said fuel grate.
Claim 5
Dependent Claim
21 words
The device of claim 1, wherein said substantially vertical surface is supported by legs which support it above said firebox floor.
Claim 6
Dependent Claim
111 words
A fireplace heat efficiency device for use in a fireplace having a firebox floor, a fuel grate, a heat source, and rear wall, said device comprising: a single imperforate sheet of material including a substantially vertical surface, a substantially horizontal surface, and a bent section between said substantially vertical surface and said substantially horizontal surface; a substantially vertical shield attached to said substantially vertical surface of said single sheet of material, and a passageway between said shield and said substantially vertical surface, said passageway providing substantially unobstructed flow of air upwardly between said shield and said substantially vertical surface, wherein said substantially horizontal surface is directly exposed to said heat source.
Claim 7
Dependent Claim
111 words
A fireplace heat efficiency device for use in a fireplace having a firebox floor, a fuel grate, a heat source, and rear wall, said device comprising: a single imperforate sheet of material including a substantially vertical surface, a substantially horizontal surface, and a bent section between said substantially vertical surface and said substantially horizontal surface; a substantially vertical shield attached to said substantially vertical surface of said single sheet of material, and a passageway between said shield and said substantially vertical surface, said passageway providing substantially unobstructed flow of air upwardly between said shield and said substantially vertical surface, wherein said substantially horizontal surface is directly exposed to said heat source.
Claim 8
Dependent Claim
20 words
The device of claim 5, wherein said substantially vertical surface is supported by support means attached to said rear wall.
Claim 9
Dependent Claim
20 words
The device of claim 5, wherein said substantially vertical surface is supported by support means attached to said fuel grate.
Claim 10
Dependent Claim
21 words
The device of claim 5, wherein said substantially vertical surface is supported by legs which support it above said firebox floor.
Claim 11
Dependent Claim
108 words
A fireplace heat efficiency device for use in a fireplace having a firebox floor, a fuel grate, a heat source, and rear wall, said device comprising: a shield attached to said rear wall, said shield being substantially parallel to said rear wall; a passageway between said rear wall and said shield, said passageway providing substantially unobstructed flow of air upwardly between said rear wall and said shield; and a substantially horizontal surface supportively attached to said rear wall by attachment means, said substantially horizontal surface supported above said shield and said firebox floor by said rear wall, said substantially horizontal surface being directly exposed to said heat source.
Claim 12
Dependent Claim
108 words
A fireplace heat efficiency device for use in a fireplace having a firebox floor, a fuel grate, a heat source, and rear wall, said device comprising: a shield attached to said rear wall, said shield being substantially parallel to said rear wall; a passageway between said rear wall and said shield, said passageway providing substantially unobstructed flow of air upwardly between said rear wall and said shield; and a substantially horizontal surface supportively attached to said rear wall by attachment means, said substantially horizontal surface supported above said shield and said firebox floor by said rear wall, said substantially horizontal surface being directly exposed to said heat source.
References Cited (Backward Citations)
US267885A
Cited
US1128358A
Cited
US2131763A
Cited
US2396535A
Cited
US3213846A
Cited
US4194490A
Cited
US4526159A
Cited
US4574774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |