US3569668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water heating and storage tank
Assignee: Individual
•
Filing: 1969-07-22
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Granted: 1971-03-09
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Expires: 1989-07-22
Abstract
Abstract A liquid heater, typically a household hot water heating and storage tank, is of cylindrical shape, horizontally disposed, with an inlet near the bottom at one end and an outlet near the top at the opposite end, and with heating means, either electrical or gas-burner, between the inlet and outlet, in or on a lower side quadrant of the tank interior, so as to generate circulation of the liquid by convection currents around the inside tank wall surface.
Inventors
- 👤 Carl B Carlisle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:38
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/18; F24H1/20; F24H1/201; F24H1/202
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
176 words
A liquid heater comprising a generally cylindrical tank, means supporting the tank with its axis in substantially horizontal position, a liquid input pipe having an opening in the lowest portion of the tank at one end thereof, a liquid discharge pipe having an opening in the uppermost portion of the tank at the opposite end thereof, and heating means located in the tank between the pipe openings and confined to a lower quadrant of the tank interior at one side of the vertical central plane of the tank and below the horizontal central plane thereof, said heating means comprising a plurality of electric heating units mounted in the tank wall and projecting radially into the tank interior, at least one of said units projecting into the tank at an angle of substantially 45* to the vertical, whereby liquid heated by contact with said means will ascend into the directly upper quadrant and then move down through the two quadrants on the opposite side of the tank for recirculation through said first named quadrant and reheating therein.
Claim 2
Dependent Claim
176 words
A liquid heater comprising a generally cylindrical tank, means supporting the tank with its axis in substantially horizontal position, a liquid input pipe having an opening in the lowest portion of the tank at one end thereof, a liquid discharge pipe having an opening in the uppermost portion of the tank at the opposite end thereof, and heating means located in the tank between the pipe openings and confined to a lower quadrant of the tank interior at one side of the vertical central plane of the tank and below the horizontal central plane thereof, said heating means comprising a plurality of electric heating units mounted in the tank wall and projecting radially into the tank interior, at least one of said units projecting into the tank at an angle of substantially 45* to the vertical, whereby liquid heated by contact with said means will ascend into the directly upper quadrant and then move down through the two quadrants on the opposite side of the tank for recirculation through said first named quadrant and reheating therein.
Claim 3
Dependent Claim
27 words
A liquid heater as claimed in claim 1 in which one of said units projects into the tank in substantially the horizontal diametric plane of the tank.
References Cited (Backward Citations)
US3103575A
Cited
US1823803A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |