US4091794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fireplace heat extractor
Assignee: Individual
•
Filing: 1976-11-24
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Granted: 1978-05-30
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Expires: 1996-11-24
Abstract
Abstract A fireplace heat extractor comprising an air-shield, such as a glass screen, to be mounted across the fireplace opening with manually controlled, limited capacity openings therethrough that admit just enough air into the fireplace to support combustion. Baffle means prevent such air from bypassing the fire. A blower directs air through a horizontal header extending through the air-shield into place, and then through an array of tubular air ducts which extend downwardly and rearwardly from the header to function also as a fire basket. The ducts extend up along the back of the fireplace and then forwardly to open back through the air-shield into the room. Replaceable fill bars are positioned between the fire basket portion of the ducts to improve coal-supporting characteristics.
Inventors
- 👤 James J. Stites
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:19
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/185; F24B1/188; F24B1/1885; F24B1/1886
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
A fireplace heat extractor comprising: an impervious air shield adapted to be supported on the hearth of a fireplace and having a flat bottom surface to engage said hearth, and having planar side and top surfaces of a size and shape to engage the face of a fireplace around the sides and top of the fireplace opening and block air movement thereinto; limited capacity openings in the lower portion of said air shield; manually operated damper means for said limited capacity openings; a tubular, generally horizontal header extending through said air shield and across the lower portion of said air shield; air intake means at an inlet end of said header, said intake means being positioned outward of said air shield; means blocking flow out through the other end of said header; an array of tubular ducts opening from said header and extending rearwardly therefrom to form a support for fireplace fuel and the upwardly, terminating in top portions extending forwardly through said air shield to open outwardly therefrom, so that air movement outward through said air shield confined to flow through said ducts.
Claim 2
Dependent Claim
184 words
A fireplace heat extractor comprising: an impervious air shield adapted to be supported on the hearth of a fireplace and having a flat bottom surface to engage said hearth, and having planar side and top surfaces of a size and shape to engage the face of a fireplace around the sides and top of the fireplace opening and block air movement thereinto; limited capacity openings in the lower portion of said air shield; manually operated damper means for said limited capacity openings; a tubular, generally horizontal header extending through said air shield and across the lower portion of said air shield; air intake means at an inlet end of said header, said intake means being positioned outward of said air shield; means blocking flow out through the other end of said header; an array of tubular ducts opening from said header and extending rearwardly therefrom to form a support for fireplace fuel and the upwardly, terminating in top portions extending forwardly through said air shield to open outwardly therefrom, so that air movement outward through said air shield confined to flow through said ducts.
Claim 3
Dependent Claim
62 words
The fireplace heat extractor defined by claim 1 wherein: said air shield comprises: a front panel; and side panels adapted to abut the face of a fireplace; said header extending through one of said side panels; and a hood extending over the tops of said front and said panels; said planar side and top surfaces being on side panels and hood, respectively.
Claim 4
Dependent Claim
31 words
The fireplace heat extractor defined by claim 2 wherein: said top portions of the ducts extend through said hood; and said front and side panels are slidable relative to said hood.
Claim 5
Dependent Claim
44 words
The fireplace heat extractor defined by claim 1 including: means restricting air flow from said limited capacity openings to the spaces between said tubular ducts comprising: a baffle plate extending rearward from the inner surface of said air shield to terminate below said header.
Claim 6
Dependent Claim
47 words
The fireplace heat extractor defined by claim 1 including: generally horizontal replacable filler members removably supported disposed between said rearward extending portions of said tubular ducts; said filler members being slightly narrower than the spaces between ducts to allow passage of circulating air and falling of ashes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |