Patent US4660541A successfully refreshed from Google Patents.
US4660541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water heater with submerged combustion chamber
Assignee: SABH US Water Heater Group Inc
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Filing: 1986-09-05
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Granted: 1987-04-28
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Expires: 2006-09-05
Abstract
Abstract An improved water heater has a submerged combustion chamber providing increased efficiency, lowered production of oxides of nitrogen and ease of manufacture. The water heater has a horizontal cylindrical combustion chamber and a flue tube having a closed bottom penetrating through a major portion of the combustion chamber along a diameter of the combustion chamber causing turbulent combustion.
Inventors
- 👤 Henry J. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:04
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/18; F24H1/20; F24H1/205; F24H1/206
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
A fluid heater comprising: (a) an elongated combustion chamber having a generally uniform cross section over its length and being horizontally disposed; (b) a vertical flue tube extending downwardly into said combustion chamber wherein a bottom of said flue tube is closely spaced from a bottom of said chamber to thereby divide said chamber into first and second portions, said flue having a closed bottom; (c) a flue opening in said flue tube located in a side of said flue tube facing said first portion and disposed a given distance above said closed bottom so as to retain exhaust condensate for evaporation; and (d) a burner disposed in said combustion chamber second portion projecting a flame to impinge upon said flue tube to reduce the formation of oxides of nitrogen of combustion.
Claim 2
Dependent Claim
132 words
A fluid heater comprising: (a) an elongated combustion chamber having a generally uniform cross section over its length and being horizontally disposed; (b) a vertical flue tube extending downwardly into said combustion chamber wherein a bottom of said flue tube is closely spaced from a bottom of said chamber to thereby divide said chamber into first and second portions, said flue having a closed bottom; (c) a flue opening in said flue tube located in a side of said flue tube facing said first portion and disposed a given distance above said closed bottom so as to retain exhaust condensate for evaporation; and (d) a burner disposed in said combustion chamber second portion projecting a flame to impinge upon said flue tube to reduce the formation of oxides of nitrogen of combustion.
Claim 3
Dependent Claim
24 words
The fluid heater of claim 1 wherein said fluid in water contained in a tank and said combustion chamber is disposed within said tank.
Claim 4
Dependent Claim
59 words
The fluid heater of claim 1 wherein said combustion chamber has a circular cross section, said flue tube has a circular cross section, said flue tube has a diameter approximately equal to two-thirds of the diameter of said combustion chamber, and said flue tube penetrates along a diameter of said combustion chamber occupying three-forths of said combustion chamber diameter.
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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) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |