Patent EP0111161A2 successfully refreshed from Google Patents.
Patent US6175586B1 successfully refreshed from Google Patents.
US4147135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for reducing flue gas heat losses
Assignee: Individual
•
Filing: 1977-09-22
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Granted: 1979-04-03
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Expires: 1997-09-22
Abstract
Abstract A device for the reduction of heat losses due to flue gasses in boilers of the type having a flue and which are operated with oil or gas and wherein the boiler has a heat exchanger in the flue serving to reduce the temperature of the flue gases. A heat pipe having a U-shaped configuration is disposed in the flue with the heat exchanger being positioned between the pipe ends, and the warm side of the heat pipe is between the boiler and the heat exchanger.
Inventors
- 👤 Donald Herbst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:10
CPC Classifications
F; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0007; F28D15/00; F28D15/02; Y; Y10; Y10S; Y10S165/00; Y10S165/921
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
A device for the reduction of the heat losses due to flue gases in boilers having a flue and which are operated with oil or gas comprising: a heat exchanger located in said boiler flue, said heat exchanger serving for the reduction of the temperature of the flue gases and through which water from the boiler is passed; and a heat pipe having opposite, longitudinally spaced ends in said flue, said heat exchanger being positioned between said heat pipe ends and wherein the warm side of the heat tube is located between the boiler and the heat exchanger.
Claim 2
Independent Claim
98 words
A device for the reduction of the heat losses due to flue gases in boilers having a flue and which are operated with oil or gas comprising: a heat exchanger located in said boiler flue, said heat exchanger serving for the reduction of the temperature of the flue gases and through which water from the boiler is passed; and a heat pipe having opposite, longitudinally spaced ends in said flue, said heat exchanger being positioned between said heat pipe ends and wherein the warm side of the heat tube is located between the boiler and the heat exchanger.
Claim 3
Dependent Claim
48 words
The device according to claim 1 characterized by the fact that the heat exchanger consists of at least two branches which are located in the flue in a row and that the heat pipe corresponds with the far branch of the heat exchanger with reference to the boiler.
Claim 4
Dependent Claim
22 words
The device according to claim 2 characterized by the fact that the branches of the heat exchanger are located in a row.
Claim 5
Dependent Claim
22 words
The device according to claim 2 characterized by the fact that the branches of the heat exchanger are located in a series.
References Cited (Backward Citations)
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Cited
US2153942A
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US2623506A
Cited
US2681047A
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US2854220A
Cited
US4029142A
Cited
US3993244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |