Patent US3669351A successfully refreshed from Google Patents.
US3669351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circulation water heater with domestic hot water supply
Assignee: Vaillant GmbH
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Filing: 1970-08-07
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Granted: 1972-06-13
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Expires: 1990-08-07
Abstract
Abstract A feed line leads from a water heater to a radiator and to a heat exchanger for domestic water. A return line has branches from both the radiator and the heat exchanger to a valve which communicates with the return trunk to the water heater.
Inventors
- 👤 Hans Meier
- 👤 Frithjof Carouge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:40
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/10; F24D19/1006; F24D19/1066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
In an apparatus for heating a radiator and a domestic water heat exchanger from a water heater including first means defining a feed line from the water heater with branches to the radiator and the heat exchanger, second means having branches from the radiator and heat exchanger respectively which join a return line to the water heater, and a change-over valve, the improvement wherein said valve is located at the point in said second means where the branches thereof join the return line, said valve always performing a closing movement oppositely to the direction of water flow.
Claim 2
Dependent Claim
97 words
In an apparatus for heating a radiator and a domestic water heat exchanger from a water heater including first means defining a feed line from the water heater with branches to the radiator and the heat exchanger, second means having branches from the radiator and heat exchanger respectively which join a return line to the water heater, and a change-over valve, the improvement wherein said valve is located at the point in said second means where the branches thereof join the return line, said valve always performing a closing movement oppositely to the direction of water flow.
References Cited (Backward Citations)
US3426971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |