Patent US4379447A successfully refreshed from Google Patents.
US4379447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat saver for household heaters
Assignee: Individual
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Filing: 1981-02-27
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Granted: 1983-04-12
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Expires: 2001-02-27
Abstract
Abstract A heat saving and recovery system which includes a rectangular housing insert for a furnace flue gas duct incorporating a coil carrying a heat transfer fluid such was water. The coil communicates with a cold return conduit or other heat transfer device in a forced flow system to transfer heat from the chimney conduit to the return fluid intended to be heated by the furnace.
Inventors
- 👤 Lawrence A. Schott
- 👤 Roger A. Schott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:20
CPC Classifications
F; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0007; F24; F24D; F24D12/00; F24D12/02; F24D2200/00; F24D2200/16; F24D2200/18; Y; Y02; Y02B; Y02B30/00; Y10; Y10S; Y10S165/00; Y10S165/901
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
A heat saving system for recovering heat from a furnace chimney flue pipe which comprises: (a) a chamber in said flue pipe through which the flue gases pass, (b) a first heat exchange coil in said chamber interposed in the path of flue gas, (c) a cold fluid inlet leading to said furnace, (d) a fluid in said coil, and (e) means to connect said coil to said cold fluid inlet to transfer heat from said chimney flue pipe to the inlet fluid to be heated in said furnace, said chamber comprising a rectangular box of fireproof material having an opening at opposite ends to connect to a chimney flue pipe, and said coil being mounted in a rectangular frame extending diagonally from one corner of said box to a diagonally opposite corner in a plane angled to the path between said openings.
Claim 2
Dependent Claim
143 words
A heat saving system for recovering heat from a furnace chimney flue pipe which comprises: (a) a chamber in said flue pipe through which the flue gases pass, (b) a first heat exchange coil in said chamber interposed in the path of flue gas, (c) a cold fluid inlet leading to said furnace, (d) a fluid in said coil, and (e) means to connect said coil to said cold fluid inlet to transfer heat from said chimney flue pipe to the inlet fluid to be heated in said furnace, said chamber comprising a rectangular box of fireproof material having an opening at opposite ends to connect to a chimney flue pipe, and said coil being mounted in a rectangular frame extending diagonally from one corner of said box to a diagonally opposite corner in a plane angled to the path between said openings.
Claim 3
Dependent Claim
173 words
A heat saving system for recovering heat from a furnace chimney flue pipe which comprises: (a) a chamber in said flue pipe through which the flue gases pass, (b) a first heat exchange coil in said chamber interposed in the path of flue gas, (c) a cold fluid inlet leading to said furnace, (d) a fluid in said coil, and (e) means to connect said coil to said cold fluid inlet to transfer heat from said chimney flue pipe to the inlet fluid to be heated in said furnace, said chamber comprising a rectangular box of fireproof material having an inlet opening and an outlet opening at opposite ends to connect to a chimney flue pipe, said coil being mounted in a plane within a rectangular frame extending diagonally from a lowest point in said box at the inlet end nearest the heat source to a highest point in a diagonally opposite corner at the outlet end of the box, said plane being angled to the path of flue gases between said openings.
Claim 4
Dependent Claim
173 words
A heat saving system for recovering heat from a furnace chimney flue pipe which comprises: (a) a chamber in said flue pipe through which the flue gases pass, (b) a first heat exchange coil in said chamber interposed in the path of flue gas, (c) a cold fluid inlet leading to said furnace, (d) a fluid in said coil, and (e) means to connect said coil to said cold fluid inlet to transfer heat from said chimney flue pipe to the inlet fluid to be heated in said furnace, said chamber comprising a rectangular box of fireproof material having an inlet opening and an outlet opening at opposite ends to connect to a chimney flue pipe, said coil being mounted in a plane within a rectangular frame extending diagonally from a lowest point in said box at the inlet end nearest the heat source to a highest point in a diagonally opposite corner at the outlet end of the box, said plane being angled to the path of flue gases between said openings.
References Cited (Backward Citations)
US3251406A
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US3934798A
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US4044820A
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US4122999A
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US4138062A
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US4194558A
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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) | 1986-04-11 | 1986-10-11 | 1987-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-11 | 1990-10-11 | 1991-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-11 | 1994-10-11 | 1995-04-12 | $7700.00 | Window Closed / Lapsed |