Patent US3859964A successfully refreshed from Google Patents.
US3859964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Once through boiler
Assignee: Mitsui Engineering and Shipbuilding Co Ltd
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Filing: 1973-10-15
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Granted: 1975-01-14
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Expires: 1993-10-15
Abstract
Abstract An once through boiler characterized in that the drum has larger diameter pipes and smaller diameter pipes for water to be heated thereby pressure loss is generated in the smaller diameter pipes for preventing from unstable flow of the water.
Inventors
- 👤 Moribumi Kozeki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:47
CPC Classifications
F; F22; F22B; F22B21/00; F22B21/22; F22B21/26; F22B1/00; F22B1/02; F22B1/16; F22B1/162; F22B37/00; F22B37/62; F22B37/70; F28; F28D; F28D7/00; F28D7/02; F28D7/024
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A once-through boiler, comprising drum means having heating fluid inlet means and heating fluid outlet means, a downcomer chamber and a helical coil chamber both in said drum means and one within the other, a plurality of downcomer pipes in said downcomer chamber, means for supplying water to the upper ends of said downcomer pipes, a plurality of helical coil pipes in said helical coil chamber, each of said helical coil pipes being supplied at its lower end with water from the lower end of one of said downcomer pipes, said downcomer pipes and said helical coil pipes both being positioned in heat-exchange relation to said heating fluid as it passes from said inlet means to said outlet means, each of said downcomer pipes being substantially smaller in diameter than the helical coil pipe which it supplies.
Claim 2
Dependent Claim
137 words
A once-through boiler, comprising drum means having heating fluid inlet means and heating fluid outlet means, a downcomer chamber and a helical coil chamber both in said drum means and one within the other, a plurality of downcomer pipes in said downcomer chamber, means for supplying water to the upper ends of said downcomer pipes, a plurality of helical coil pipes in said helical coil chamber, each of said helical coil pipes being supplied at its lower end with water from the lower end of one of said downcomer pipes, said downcomer pipes and said helical coil pipes both being positioned in heat-exchange relation to said heating fluid as it passes from said inlet means to said outlet means, each of said downcomer pipes being substantially smaller in diameter than the helical coil pipe which it supplies.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |