Patent US3264485A successfully refreshed from Google Patents.
US3264485A
Expired / Lapsed
US
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Methods and apparatus for preventing water hammer in tailrace or suction lines
Assignee: Hitachi Ltd
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Filing: 1963-09-30
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Granted: 1966-08-02
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Expires: 1983-09-30
Abstract
No abstract record available.
Inventors
- 👤 Naganuma Susumu
- 👤 Tanaka Mizuho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:48
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/04; F16L55/045; F03; F03B; F03B11/00; F03B11/002; F03B11/04; F03B15/00; F03B15/02; F03B15/04; F03B15/06; F03B15/18; F03B3/00; F03B3/10; F03B3/103; F04; F04D; F04D15/00; F04D15/0077; F04D15/0083; F04D15/02; F04D15/0209; Y; Y02; Y02E; Y02E10/00; Y02E10/20; Y10; Y10S; Y10S415/00; Y10S415/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
AN APPARATUS FOR PREVENTING WATER HAMMER IN CONNECTION WITH HYDRAULIC DEVICES HAVING RUNNER MEANS, INLET LINE MEANS OR OUTLET LINE MEANS, A NEGATIVE PRESSURE OCCURRING IN ONE OF SAID LINE MEANS UPON COMMENCEMENT OF SUDDEN CHANGES FROM THE STEADY STATE OPERATING CONDITIONS OF SAID HYDRAULIC DEVICE, A NEGATIVE PRESSURE OCCURRING IN ONE OF SAID LINE MEANS UPON COMMENCENT OF SUDDEN CHANGES FROM THE STEADY STATE OPERATING CONDITION OF SAID HYDRAULIC DEVICE, COMPRISING SUPPLY MEANS FOR SUPPLYING COMPRESSED AIR, CONNECTING MEANS OPERATIVELY CONNECTING SAID SUPPLY MEANS WITH SAID SAID LINE MEANS FOR SUPPLYING COMPRESSED AIR TO SAID LINE MEANS INCLUDING VALVE MEANS HAVING A VALVE-ACTUATING MEANS, AND MEANS RESPONSIVE ONLY TO SAID SUDDEN CHANGES AND OPERATIVELY CONNECTED WITH SAID VALVE-ACTUATING MEANS FOR OPENING SAID VALVE MEANS TO SUPPLY COMPRESSED AIR TO SAID LINE MEANS UPON OCCURRENCE OF SUCH SUDDEN CHANGES.
Claim 2
Independent Claim
139 words
AN APPARATUS FOR PREVENTING WATER HAMMER IN CONNECTION WITH HYDRAULIC DEVICES HAVING RUNNER MEANS, INLET LINE MEANS OR OUTLET LINE MEANS, A NEGATIVE PRESSURE OCCURRING IN ONE OF SAID LINE MEANS UPON COMMENCEMENT OF SUDDEN CHANGES FROM THE STEADY STATE OPERATING CONDITIONS OF SAID HYDRAULIC DEVICE, A NEGATIVE PRESSURE OCCURRING IN ONE OF SAID LINE MEANS UPON COMMENCENT OF SUDDEN CHANGES FROM THE STEADY STATE OPERATING CONDITION OF SAID HYDRAULIC DEVICE, COMPRISING SUPPLY MEANS FOR SUPPLYING COMPRESSED AIR, CONNECTING MEANS OPERATIVELY CONNECTING SAID SUPPLY MEANS WITH SAID SAID LINE MEANS FOR SUPPLYING COMPRESSED AIR TO SAID LINE MEANS INCLUDING VALVE MEANS HAVING A VALVE-ACTUATING MEANS, AND MEANS RESPONSIVE ONLY TO SAID SUDDEN CHANGES AND OPERATIVELY CONNECTED WITH SAID VALVE-ACTUATING MEANS FOR OPENING SAID VALVE MEANS TO SUPPLY COMPRESSED AIR TO SAID LINE MEANS UPON OCCURRENCE OF SUCH SUDDEN CHANGES.
References Cited (Backward Citations)
GB191501498A
Cited
GB277433A
Cited
FR766089A
Cited
US2262191A
Cited
US2803428A
Cited
FR1075070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |