US3635211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger for fireplaces
Assignee: HENRY O ENGLERT
•
Filing: 1970-04-07
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Granted: 1972-01-18
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Expires: 1990-04-07
Abstract
Abstract A heat exchanger for an existing fireplace which includes a grate means and air-transporting means in communication with the grate means. The exchanger further includes a blower whereby when the air within the grate means is heated, the blower will move the heated air either outwardly into the room where the fireplace is located or alternatively blow it to another section of the structure. Alternatively, the structure could include within one section of the air-transporting means a supplemental heating means whereby the heat exchanger is useable for heating purposes even in the absence of a fire within the fireplace.
Inventors
- 👤 Henry O Englert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/1802; F24B1/185; F24B1/188; F24B1/1885; F24B1/1886
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
184 words
A heat exhanger for placement in the firebox of an existing fireplace and increasing the heat output thereof comprising; a base portion for supporting the burning material and including a plurality of generally parallel hollow tube sections open at one end and adapted to be placed generally parallel to the floor of the firebox with the open ends extending toward the front, a back portion comprising a plurality of hollow tubes in gaseous communication with the tubes in the base portion and adapted to carry the air heated in the base portion upwardly by convection, a top portion including a plurality of elongated hollow elements in gaseous communication with the tubes of the back portion, said hollow elements pivotable about a substantially horizontal axis and adapted to substantially close the top of the heat exchanger when in a closed position and allow free flow of the combustion gas when open whereby convection will force heated air upwardly through the tubes and out into the room and if it is desired to suppress the fire, the top elements may be pivoted to slow the draught.
Claim 2
Dependent Claim
184 words
A heat exhanger for placement in the firebox of an existing fireplace and increasing the heat output thereof comprising; a base portion for supporting the burning material and including a plurality of generally parallel hollow tube sections open at one end and adapted to be placed generally parallel to the floor of the firebox with the open ends extending toward the front, a back portion comprising a plurality of hollow tubes in gaseous communication with the tubes in the base portion and adapted to carry the air heated in the base portion upwardly by convection, a top portion including a plurality of elongated hollow elements in gaseous communication with the tubes of the back portion, said hollow elements pivotable about a substantially horizontal axis and adapted to substantially close the top of the heat exchanger when in a closed position and allow free flow of the combustion gas when open whereby convection will force heated air upwardly through the tubes and out into the room and if it is desired to suppress the fire, the top elements may be pivoted to slow the draught.
Claim 3
Dependent Claim
36 words
A heat exchanger as in claim 1 wherein the top elements are of a substantially isosceles triangular cross section having a narrow base allowing relatively unrestricted airflow when the top elements are in the open position.
Claim 4
Dependent Claim
33 words
A heat exchanger as in claim 1 wherein the top elements enclose an auxiliary heat source whereby the heat exchanger may be used to heat the room when the fire is not ignited.
References Cited (Backward Citations)
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Cited
US1365912A
Cited
US1468964A
Cited
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Cited
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US2702030A
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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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |