US4074681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forced air circulation heating unit for fireplaces
Assignee: W A RED HOT Inc
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Filing: 1975-01-30
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Granted: 1978-02-21
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Expires: 1995-01-30
Abstract
Abstract A forced air circulation heating unit is formed of a U-shaped conduit placed on the floor of the fireplace and a fan forcing air through the conduit to be heated in the fireplace and projected into the room. Jets are provided on the conduit to direct streams of air from legs of the conduit toward a base joining the legs in order to completely burn fuel thereby reducing carbon monoxide, to facilitate starting of a fire and to reduce smoking. The base of the conduit has an increased cross-sectional flow of air and the jet streams cooperate with the base to assure that the hottest part of the fire is produced by coals on and adjacent the base thereby increasing heat obtained from the unit and saving fuel.
Inventors
- 👤 Isaac C. Whiteley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:31
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/185; F24B1/188; F24B1/1885; F24B1/1886
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
216 words
A forced air circulation heating unit for installation in a fireplace comprising a generally U-shaped conduit formed of an inlet leg having an end defining an inlet for said conduit, and outlet leg having an end defining an outlet for said conduit, and a base joining said inlet and outlet legs, said conduit being adapted to be positioned on the floor of the fireplace with said inlet and outlet disposed on opposite sides of the fireplace; fan means for blowing air through said conduit from said inlet to said outlet such that air forced through said conduit is heated by fuel burned in the fireplace to supply a flow of hot air from said outlet of said conduit; and jet means including a first tube extending from said inlet leg for directing a first stream of air along said inlet leg at said conduit base and a second tube extending from said outlet leg for directing a second stream of air along said outlet leg at said conduit base, said first and second streams of air converging toward one another to provide air along said conduit base to maintain fuel on said conduit live whereby starting of a fire in the fireplace is aided, smoking of the fuel is reduced and the fuel is completely burned.
Claim 2
Dependent Claim
216 words
A forced air circulation heating unit for installation in a fireplace comprising a generally U-shaped conduit formed of an inlet leg having an end defining an inlet for said conduit, and outlet leg having an end defining an outlet for said conduit, and a base joining said inlet and outlet legs, said conduit being adapted to be positioned on the floor of the fireplace with said inlet and outlet disposed on opposite sides of the fireplace; fan means for blowing air through said conduit from said inlet to said outlet such that air forced through said conduit is heated by fuel burned in the fireplace to supply a flow of hot air from said outlet of said conduit; and jet means including a first tube extending from said inlet leg for directing a first stream of air along said inlet leg at said conduit base and a second tube extending from said outlet leg for directing a second stream of air along said outlet leg at said conduit base, said first and second streams of air converging toward one another to provide air along said conduit base to maintain fuel on said conduit live whereby starting of a fire in the fireplace is aided, smoking of the fuel is reduced and the fuel is completely burned.
Claim 3
Dependent Claim
59 words
A forced air circulation heating unit as recited in claim 1 wherein said first tube extends through a side wall of said inlet leg to an end disposed within the U-shaped configuration of said conduit and said second tube extends through a side wall of said outlet leg to an end disposed within the U-shaped configuration of said conduit.
Claim 4
Dependent Claim
31 words
A forced air circulation heating unit as recited in claim 2 wherein said base of said conduit has a greater cross-sectional flow area than said inlet leg and said outlet leg.
Claim 5
Dependent Claim
30 words
A forced air circulation heating unit as recited in claim 3 wherein said conduit has a rectangular configuration in cross section with the longer sides disposed in a horizontal plane.
Claim 6
Dependent Claim
110 words
A forced air circulation heating unit as recited in claim 1 wherein said fan means includes an electric fan having an outlet and an elbow pipe having a first end communicating with said fan outlet and a second end communicating with said conduit inlet, said elbow pipe being removable from said fan and said conduit to have said second end communicating with said fan outlet and said first end communicating with said conduit inlet whereby the flow of air through the fireplace can be reversed by moving said fan from one side of the other and reversing the position of said conduit inlet and said conduit outlet in the fireplace.
Claim 7
Dependent Claim
39 words
A forced air circulation heating unit as recited in claim 1 wherein said conduit is rectangular in cross-section and the cross-sectional flow area of said base is greater than the cross-sectional flow area of said inlet and outlet legs.
References Cited (Backward Citations)
US2231258A
Cited
US2258882A
Cited
GB622417A
Cited
US2828078A
Cited
GB1008428A
Cited
US3269383A
Cited
GB1169587A
Cited
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Cited
US3930490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |