Patent US3944136A successfully refreshed from Google Patents.
US3944136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Small building heating system
Assignee: Individual
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Filing: 1975-02-03
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Granted: 1976-03-16
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Expires: 1995-02-03
Abstract
Abstract A heater unit and draft control adapted to be connected to an existing solid, liquid or gas fueled heating furnace includes a heat exchanger having a stack gas passage connected in series to a stack from the furnace and a blower which forces air through the heat exchanger and into the plenum of the furnace. A stack cooler and/or draft control includes a pipe extending from outside of the house into the exit portion of the stack gas passage with an adjustable damper therein.
Inventors
- 👤 Edwin C. Huie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:27
CPC Classifications
F; F24; F24C; F24C1/00; F24B; F24B7/00; F24B7/005; Y; Y10; Y10S; Y10S165/00; Y10S165/901
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
In a heating system for a small building, a chimney, furnace means in the building including a burner means, combustion air supply means and flue gas exit means, stack means connecting the flue gas exit means to the chimney, conduit means completely separate from the combustion air supply means and having an inlet outside the building and an outlet connected to the stack means for supplying outside air to the stack means to cool the flue gas and to act as a damper to control the flow of the flue gas to the chimney, and an auxiliary heat exchange means in the stack means upstream from the outlet of the conduit means and receiving heat from the flue gas.
Claim 2
Dependent Claim
119 words
In a heating system for a small building, a chimney, furnace means in the building including a burner means, combustion air supply means and flue gas exit means, stack means connecting the flue gas exit means to the chimney, conduit means completely separate from the combustion air supply means and having an inlet outside the building and an outlet connected to the stack means for supplying outside air to the stack means to cool the flue gas and to act as a damper to control the flow of the flue gas to the chimney, and an auxiliary heat exchange means in the stack means upstream from the outlet of the conduit means and receiving heat from the flue gas.
Claim 3
Dependent Claim
36 words
The heating system of claim 1 wherein the auxiliary heat exchange means has an air passage having an inlet for receiving cooler air from the building and an outlet for discharging warmed air into the building.
Claim 4
Dependent Claim
17 words
The heating system of claim 2 including blower means for flowing air through the heat exchange means.
Claim 5
Dependent Claim
46 words
The heating system of claim 3 wherein the furnace means includes primary heat exchange means and primary blower means for flowing air along a predetermined path including the primary heat exchange means, the first-mentioned blower means being connected to said path to discharge into said path.
Claim 6
Dependent Claim
25 words
The heating system of claim 4 wherein the first-mentioned blower means is connected to said path at a point downstream from the primary blower means.
Claim 7
Dependent Claim
43 words
The heating system of claim 2 wherein the furnace means includes primary heat exchange means and primary blower means for flowing air along a predetermined path including the primary heat exchange means, the outlet of the air passage being connected to said path.
Claim 8
Dependent Claim
21 words
The heating system of claim 1 wherein the conduit means includes adjustable damper means for controlling the flow of air therethrough.
Claim 9
Dependent Claim
36 words
The heating system of claim 1 wherein the heat exchange means includes pipe means for conveying flue gases, the pipe means being sloped downwardly toward the chimney, and means for receiving condensate from the pipe means.
Claim 10
Dependent Claim
41 words
The heating system of claim 1 wherein the auxiliary heat exchange means includes a heat exchange section, an inlet header at one end of the heat exchange section and an outlet header at the other end of the heat exchange section.
References Cited (Backward Citations)
US1953302A
Cited
US2252784A
Cited
US2362940A
Cited
US2468909A
Cited
US2715018A
Cited
US2711683A
Cited
US2764391A
Cited
US3813039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |