Patent US3774971A successfully refreshed from Google Patents.
US3774971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device for a system of hydraulically transporting solid matters
Assignee: New Oji Paper Co Ltd
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Filing: 1971-11-16
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Granted: 1973-11-27
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Expires: 1991-11-16
Abstract
Abstract In a system of hydraulically conveying solid matters adapted to hydraulically transport a mixture of the solid such as wood chip or wood bark through a pipeline to a destination, a safety device which comprises a pressure liquid tank containing a pressure water or liquid and a pressure air or gas therein, and a pressure liquid supply line communicating said pressure liquid tank with the pipeline. Said safety device permits the liquid contained in said pressure liquid tank to be delivered through said pressure liquid supply line to the pipeline in case of emergency with the help of the expanding pressure of the air or gas in said pressure liquid tank.
Inventors
- 👤 T Shimizu
- 👤 K Mizuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:14
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
219 words
In a system of hydraulically conveying solid matters such as wood chip or wood bark through a pipeline to a destination, a safety device which comprises a pressure liquid tank containing a pressure water or liquid and a pressure air or gas therein, two main shut-off valves installed in series with each other in the pipeline, a pressure liquid supply line communicating said pressure liquid tank with the pipeline between said two main shut-off valves, a pressure liquid supply branch line from an intermediate portion of said pressure liquid supply line connecting a portion of the pipeline which is disposed opposite the connection of said pressure liquid supply line to the pipeline with respect to one of said two main shut-off valves, and two pressure liquid stop valves installed in parallel to each other in the pressure liquid supply line and the pressure liquid supply branch line respectively, which permits one of said main shut-off valves to be closed completely and the liquid contained in said pressure liquid tank to be injected through said pressure liquid supply line to the pipeline in case of emergency with the help of the expanding pressure of the air or gas in said pressure liquid tank whereby the flow rate of the mixture in the pipeline can be maintained at a predetermined level.
Claim 2
Dependent Claim
219 words
In a system of hydraulically conveying solid matters such as wood chip or wood bark through a pipeline to a destination, a safety device which comprises a pressure liquid tank containing a pressure water or liquid and a pressure air or gas therein, two main shut-off valves installed in series with each other in the pipeline, a pressure liquid supply line communicating said pressure liquid tank with the pipeline between said two main shut-off valves, a pressure liquid supply branch line from an intermediate portion of said pressure liquid supply line connecting a portion of the pipeline which is disposed opposite the connection of said pressure liquid supply line to the pipeline with respect to one of said two main shut-off valves, and two pressure liquid stop valves installed in parallel to each other in the pressure liquid supply line and the pressure liquid supply branch line respectively, which permits one of said main shut-off valves to be closed completely and the liquid contained in said pressure liquid tank to be injected through said pressure liquid supply line to the pipeline in case of emergency with the help of the expanding pressure of the air or gas in said pressure liquid tank whereby the flow rate of the mixture in the pipeline can be maintained at a predetermined level.
Claim 3
Dependent Claim
234 words
In a system of hydraulically conveying solid matters such as wood chip or wood bark through a pipeline to a destination, a safety device which comprises a pressure liquid tank containing a pressure water or liquid and a pressure air or gas therein, two main shut-off valves installed in series with eAch other in the pipeline, a pressure liquid supply line communicating said pressure liquid tank with the pipeline between said two main shut-off valves, a liquid feed system connected to said pressure liquid supply line at an intermediate portion thereof, a pressure liquid supply branch line from an intermediate portion of said pressure liquid supply line connecting to a portion of the pipeline which is disposed opposite the connection of said pressure liquid supply line to the pipeline with respect to one of said two main shut-off valves, and two pressure liquid stop valves installed in parallel to each other in the pressure liquid supply line and the pressure liquid supply branch line respectively, which permits one of said main shut-off valves to be closed completely and the liquid contained in said pressure liquid tank be first injected through said pressure liquid supply line to the pipeline in case of emergency and then a liquid to be fed to the pipline through said liquid feed system, whereby the flow rate of the mixture in the pipeline can be maintained at a predetermined level.
Claim 4
Dependent Claim
234 words
In a system of hydraulically conveying solid matters such as wood chip or wood bark through a pipeline to a destination, a safety device which comprises a pressure liquid tank containing a pressure water or liquid and a pressure air or gas therein, two main shut-off valves installed in series with eAch other in the pipeline, a pressure liquid supply line communicating said pressure liquid tank with the pipeline between said two main shut-off valves, a liquid feed system connected to said pressure liquid supply line at an intermediate portion thereof, a pressure liquid supply branch line from an intermediate portion of said pressure liquid supply line connecting to a portion of the pipeline which is disposed opposite the connection of said pressure liquid supply line to the pipeline with respect to one of said two main shut-off valves, and two pressure liquid stop valves installed in parallel to each other in the pressure liquid supply line and the pressure liquid supply branch line respectively, which permits one of said main shut-off valves to be closed completely and the liquid contained in said pressure liquid tank be first injected through said pressure liquid supply line to the pipeline in case of emergency and then a liquid to be fed to the pipline through said liquid feed system, whereby the flow rate of the mixture in the pipeline can be maintained at a predetermined level.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |