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Patent US4182123A successfully refreshed from Google Patents.
US4182123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic power plant
Assignee: Fuji Electric Co Ltd
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Filing: 1978-01-18
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Granted: 1980-01-08
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Expires: 1998-01-18
Abstract
Abstract A hydraulic power plant has a reservoir with a dam wall, a water turbine connected to a generator, a penstock extending from the reservoir to the water turbine and passing over the dam wall without passing through the dam wall to supply water from the reservoir to the turbine, and a vacuum pump adapted to fill at least a portion of the penstock with water by a siphon effect and being connected at a substantially uppermost portion of the penstock which is located on the top of the dam wall.
Inventors
- 👤 Tsuneo Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:16
CPC Classifications
F; F03; F03B; F03B13/00; F03B13/10; F03B13/105; F03B13/08; F03B13/086; Y; Y02; Y02E; Y02E10/00; Y02E10/20; Y10; Y10T; Y10T137/00; Y10T137/2713
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
A hydraulic power plant comprising a reservoir having a dam wall, a water turbine and generator means connected thereto, said turbine being on the opposite side of the dam wall from the reservoir and below the level of the surface of the reservoir, and a penstock for supplying water from the reservoir to the water turbine, said penstock extending from the reservoir over the dam wall to the water turbine without passing through said dam wall, and vacuum pump means connected to said penstock at substantially the uppermost portion of the penstock for filling the penstock with water.
Claim 2
Dependent Claim
98 words
A hydraulic power plant comprising a reservoir having a dam wall, a water turbine and generator means connected thereto, said turbine being on the opposite side of the dam wall from the reservoir and below the level of the surface of the reservoir, and a penstock for supplying water from the reservoir to the water turbine, said penstock extending from the reservoir over the dam wall to the water turbine without passing through said dam wall, and vacuum pump means connected to said penstock at substantially the uppermost portion of the penstock for filling the penstock with water.
Claim 3
Dependent Claim
30 words
A hydraulic power plant according to claim 1, further comprising vacuum breaker means connected to the uppermost portion of said penstock for shutting off water flow into the water turbine.
Claim 4
Dependent Claim
41 words
A hydraulic power plant according to claim 1, further comprising a bypass passage passing through the dam wall and connecting the reservoir to a portion of the penstock downstream of the uppermost portion of said penstock and upstream of said turbine.
Claim 5
Dependent Claim
62 words
A hydraulic power plant according to claim 1, further comprising a bypass passage passing through the dam wall connecting the reservoir to a portion of the penstock downstream of the uppermost portion of said penstock and upstream of said turbine, and shutter means in the outlet of the penstock downstream of said turbine for opening and closing the outlet of said penstock.
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) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |