Patent US3929505A successfully refreshed from Google Patents.
Patent US4303042A successfully refreshed from Google Patents.
US4303042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water heater
Assignee: TAADA KK
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Filing: 1979-09-24
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Granted: 1981-12-01
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Expires: 1999-09-24
Abstract
Abstract A water heater incorporating a cylindrical heat exchanger installed laterally in the lower part of a water tank. The interior of the heat exchanger has a plurality of circular baffles spaced transversely of the interior. An exhaust pipe covered with a heat insulator extends vertically from the heat exchanger to outside the water tank.
Inventors
- 👤 Tateo Sumiyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:13
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/18; F24H1/20; F24H1/205; F24H1/206
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
250 words
A water heater comprising: a vertically extending water tank; a substantially cylindrical heat exchanger positioned horizontally in said water tank and extending diametrically across the lower part of said water tank and spaced above the bottom of said tank, said heat exchanger having an open end secured in water tight relation in the wall of said water tank on one side of said tank and having a closed end projecting out of the wall of said tank on the other side of said tank in water tight relation therewith, said heat exchanger having a combustion chamber adjacent the open end and an exhaust gas chamber cocupying the space between said combustion chamber and the closed end of said heat exchanger; a burner directed into said combustion chamber from the open end thereof; a baffle assembly removably fitted into said exhaust gas chamber and having a plurality of circular baffles extending transversely of said heat exchanger and spaced along the length of said exhaust gas chamber, each baffle having an aperture in the edge thereof positioned diametrically opposite the corresponding apertures in the edges of adjacent baffles, a plurality of cylindrical spacers extending between adjacent baffles, and a rod extending through said baffles and said spacers and secured to the end baffles at the opposite ends of said assembly; and an exhaust pipe communicating with said heat exchanger at the closed end thereof and extending vertically therefrom outside said water tank, said exhaust pipe being covered with a heat insulating material.
Claim 2
Dependent Claim
250 words
A water heater comprising: a vertically extending water tank; a substantially cylindrical heat exchanger positioned horizontally in said water tank and extending diametrically across the lower part of said water tank and spaced above the bottom of said tank, said heat exchanger having an open end secured in water tight relation in the wall of said water tank on one side of said tank and having a closed end projecting out of the wall of said tank on the other side of said tank in water tight relation therewith, said heat exchanger having a combustion chamber adjacent the open end and an exhaust gas chamber cocupying the space between said combustion chamber and the closed end of said heat exchanger; a burner directed into said combustion chamber from the open end thereof; a baffle assembly removably fitted into said exhaust gas chamber and having a plurality of circular baffles extending transversely of said heat exchanger and spaced along the length of said exhaust gas chamber, each baffle having an aperture in the edge thereof positioned diametrically opposite the corresponding apertures in the edges of adjacent baffles, a plurality of cylindrical spacers extending between adjacent baffles, and a rod extending through said baffles and said spacers and secured to the end baffles at the opposite ends of said assembly; and an exhaust pipe communicating with said heat exchanger at the closed end thereof and extending vertically therefrom outside said water tank, said exhaust pipe being covered with a heat insulating material.
Claim 3
Dependent Claim
40 words
A water heater as claimed in claim 1 in which said rod extends beyond one end of said assembly and abuts a part of the structure of said water heater for maintaining said assembly in position in said heat exchanger.
Claim 4
Dependent Claim
71 words
A water heater as claimed in claim 2 in which said rod extends toward said one end of said heat exchanger for abutting the structure associated with said burner, and said assembly further comprises a second rod extending through said baffles and secured to the end baffles in the assembly and extending to and abutting the closed end of said heat exchanger for further positioning said assembly in said heat exchanger.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |