US3601099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-heated once-through positive flow water heaters
Assignee: Vaillant GmbH
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Filing: 1969-05-19
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Granted: 1971-08-24
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Expires: 1989-05-19
Abstract
Abstract A gas water heater has a heater shaft terminating in a fin block. A pair of exhaust hoods are used interchangeably on the water heater. Each of these hoods has a bottom portion fitting the top of the fin block. One of the hoods incorporates a backdraft-flow-preventing apparatus. The other incorporates a centrifugal blower with a vertical shaft and a vertically extending intake with a horizontally extending discharge.
Inventors
- 👤 Karl-Ernst Vaillant
- 👤 Helmut Schmidt
- 👤 Robert Lehnartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:35
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/0005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
In an apparatus including a gas-heated once-through positive flow water heater having a heater shaft terminating in a fin block, the improvement comprising in combination therewith: a pair of interchangeable exhaust gas hoods of a size to fit said fin block and usable one at a time on said fin block; back draft flow safety means incorporating one of said hoods; and Exhaust gas blower means incorporating the other of said hoods; whereby the heater may readily be adapted for use in different types of installation.
Claim 2
Dependent Claim
86 words
In an apparatus including a gas-heated once-through positive flow water heater having a heater shaft terminating in a fin block, the improvement comprising in combination therewith: a pair of interchangeable exhaust gas hoods of a size to fit said fin block and usable one at a time on said fin block; back draft flow safety means incorporating one of said hoods; and Exhaust gas blower means incorporating the other of said hoods; whereby the heater may readily be adapted for use in different types of installation.
Claim 3
Dependent Claim
51 words
In an apparatus as set forth in claim 1, wherein said blower means includes an exhaust gas blower having an integral motor, said blower and motor having a shaft rotating about a vertical axis, said blower having a vertical suction branch communicating with the respective hood and a horizontal discharge branch.
Claim 4
Dependent Claim
63 words
In an apparatus as set forth in claim 2, wherein said respective hood has a mounting flange at the top thereof; and said blower has a mounting flange at the bottom thereof about said suction branch with the blower flange being positioned on the hood flange; said flanges having means to connect the flanges at different angular positions with respect to each other.
Claim 5
Dependent Claim
38 words
In an apparatus as set forth in claim 3, including a casing about said heater, which casing has a rear wall, said blower being within said casing and including means to mount the blower on said rear wall.
Claim 6
Dependent Claim
48 words
In an apparatus as set forth in claim 4 and for use with an exhaust gas duct, wherein said rear wall has means to provide a plurality of openings to admit said duct for communication with said discharge branch at different angular positions with respect to said casing.
Claim 7
Dependent Claim
42 words
In an apparatus as set forth in claim 5, wherein said respective hood defines a vertical axis, said suction branch being inclined towards one side of said axis, said discharge branch being substantially horizontal and having an axis intersecting said hood axis.
Claim 8
Dependent Claim
20 words
In an apparatus as set forth in claim 6, including draft control means between said discharge branch and said duct.
Claim 9
Dependent Claim
60 words
In an apparatus as set forth in claim 2 and for use with an exhaust gas duct, and including a casing about said heater, which casing has a rear wall, said rear wall having means to provide a plurality of openings to admit said duct for communication with said discharge branch at different angular positions with respect to said casing.
Claim 10
Dependent Claim
42 words
In an apparatus as set forth in claim 8, wherein said respective hood defines a vertical axis, said suction branch being inclined towards one side of said axis, said discharge branch being substantially horizontal and having an axis intersecting said hood axis.
Claim 11
Dependent Claim
69 words
In an apparatus as set forth in claim 2, including a casing about said heater, which casing has an upper end wall with an opening therethrough, said respective hood being within said casing and extending upwardly from said block toward said opening, said blower being releasably mounted on said wall with said suction branch communicating with said hood through said opening, and a hood-shaped blower casing covering said blower.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |