Patent US4790291A successfully refreshed from Google Patents.
US4790291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sediment agitating apparatus for water heater
Assignee: AOS Holding Co
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Filing: 1987-05-07
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Granted: 1988-12-13
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Expires: 2007-05-07
Abstract
Abstract An agitating mechanism to aid in preventing the buildup of sediment in a gas fired water heater. The agitating mechanism includes a pump located outside of the tank and a first conduit connects the inlet of the pump to the interior of the tank, while a second conduit connects the discharge side of the pump to the lower end of the tank. Operation of the pump will withdraw water from the tank and discharge the water back into the tank adjacent the lower head to help provide agitation and prevent the buildup of sediment. The conduits, as well as the pump, can be mounted on a cleanout panel which encloses a cleanout opening in the lower end of the tank.
Inventors
- 👤 Fred E. Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:40
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/18; F24H9/00; F24H9/0005; F24H9/0042; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/85954
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
188 words
A water heater, comprising a tank to contain water to be heated and having a lower head, inlet means for introducing cold water to said tank, outlet means disposed in the upper end of the tank for withdrawing heated water, heating means for heating the water in said tank, and agitating means for agitating the water in said tank, said agitating means comprising a closed circulation system including pumping means, first conduit means providing communication between the interior of the tank and the suction side of said pump means and second conduit means providing communication between the discharge side of said pumping means and the interior of said tank, said pumping means being constructed and arranged to withdraw water from said tank through said first conduit means and discharge through said second conduit means into the lower end of the tank and across said lower head to agitate the water and prevent buildup of sediment on the lower head of said tank, said tank having an access opening in the lower portion thereof, a removable panel to enclose said opening, said agitating means being carried by said panel.
Claim 2
Dependent Claim
188 words
A water heater, comprising a tank to contain water to be heated and having a lower head, inlet means for introducing cold water to said tank, outlet means disposed in the upper end of the tank for withdrawing heated water, heating means for heating the water in said tank, and agitating means for agitating the water in said tank, said agitating means comprising a closed circulation system including pumping means, first conduit means providing communication between the interior of the tank and the suction side of said pump means and second conduit means providing communication between the discharge side of said pumping means and the interior of said tank, said pumping means being constructed and arranged to withdraw water from said tank through said first conduit means and discharge through said second conduit means into the lower end of the tank and across said lower head to agitate the water and prevent buildup of sediment on the lower head of said tank, said tank having an access opening in the lower portion thereof, a removable panel to enclose said opening, said agitating means being carried by said panel.
Claim 3
Dependent Claim
28 words
The water heater of claim 1, wherein said first and second conduit means are mounted concentrically and communicate through a single opening with the interior of said tank.
Claim 4
Dependent Claim
36 words
The water heater of claim 1, wherein said second conduit means has one end connected to the discharge side of said pumping means and the opposite end is disposed with said tank and defines an outlet.
Claim 5
Dependent Claim
208 words
A water heater, comprising a tank to contain water to be heated and having a lower head, inlet means for introducing cold water to said tank, outlet means disposed in the upper end of the tank for withdrawing heated water, heating means disposed beneath said lower head for heating the water in said tank, the lower portion of said tank having a clean out opening, a panel removably secured to the outer surface of said tank and enclosing said opening, and agitating means separate from said inlet means for agitating the water in the tank and carried solely by said panel, said agitating means comprising a closed circulation system including a pump, first conduit means providing communication between the interior of the tank and the suction side of the pump and second conduit means providing communication between the discharge side of the pump and the interior of the tank, said second conduit means being provided with an outlet disposed adjacent said lower head, operation of said pump acting to withdraw water from said tank through said first conduit means and discharge the water into the lower end of the tank through said second conduit means to agitate the water and prevent buildup of sediment on said lower head.
Claim 6
Dependent Claim
208 words
A water heater, comprising a tank to contain water to be heated and having a lower head, inlet means for introducing cold water to said tank, outlet means disposed in the upper end of the tank for withdrawing heated water, heating means disposed beneath said lower head for heating the water in said tank, the lower portion of said tank having a clean out opening, a panel removably secured to the outer surface of said tank and enclosing said opening, and agitating means separate from said inlet means for agitating the water in the tank and carried solely by said panel, said agitating means comprising a closed circulation system including a pump, first conduit means providing communication between the interior of the tank and the suction side of the pump and second conduit means providing communication between the discharge side of the pump and the interior of the tank, said second conduit means being provided with an outlet disposed adjacent said lower head, operation of said pump acting to withdraw water from said tank through said first conduit means and discharge the water into the lower end of the tank through said second conduit means to agitate the water and prevent buildup of sediment on said lower head.
Claim 7
Dependent Claim
35 words
The water heater of claim 4, wherein said heating means comprises a gas fired burner located beneath the lower head, and said through said tank for discharging waste gases of combustion generated by said burner.
Claim 8
Dependent Claim
26 words
The water heater of claim 4, wherein the axis of said outlet is generally horizontal and is disposed to direct the water across said lower head.
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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) | 1991-12-13 | 1992-06-13 | 1992-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-13 | 1996-06-13 | 1996-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-13 | 2000-06-13 | 2000-12-13 | $7700.00 | Window Closed / Lapsed |