US3772891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conduit structure for migrating fish
Assignee: Individual
•
Filing: 1971-10-20
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Granted: 1973-11-20
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Expires: 1991-10-20
Abstract
Abstract A conduit for the passage of fish about a dam or other obstruction with the end segments of the conduit being vertically positionable by winch means to best suit migrating fish. The conduit ends are in submerged placement upstream and downstream from the dam or obstruction with the main portion of the conduit being of a constant gradient to facilitate fish passage. Baffle means are spaced along the conduit interior to cause the water flow therethrough to be in an eddying manner to provide a series of resting zones for the migrating fish. Means are provided for adding a fish attracting substance to the conduit flow.
Inventors
- 👤 J Raistakka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:12
CPC Classifications
E; E02; E02B; E02B8/00; E02B8/08; E02B8/085; Y; Y02; Y02A; Y02A40/00; Y02A40/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
154 words
A conduit structure closed from the atmosphere through which migrating fish may circumvent a waterway obstruction, said conduit structure comprising, a length of tubular conduit disposed in circumventing relationship to the waterway obstruction with end segments of the conduit being vertially positionable and submerged upstream and downstream of the obstruction, said conduit having at least one of its end segments provided with multiple apertures to facilitate entry of fish, said length of conduit fully occupied by water flowing therethrough, remotely controlled winch means disposed adjacent the upstream and downstream conduit segments for imparting vertical movement thereto whereby the depth of said segments may be varied to best accommodate the entry and exit of migrating fish, means circumferentially spaced about the interior wall surface of said conduit at spaced apart intervals therealong to impart an eddying flow to the water creating zones of random water currents constituting resting areas for fish migrating through the conduit.
Claim 2
Dependent Claim
154 words
A conduit structure closed from the atmosphere through which migrating fish may circumvent a waterway obstruction, said conduit structure comprising, a length of tubular conduit disposed in circumventing relationship to the waterway obstruction with end segments of the conduit being vertially positionable and submerged upstream and downstream of the obstruction, said conduit having at least one of its end segments provided with multiple apertures to facilitate entry of fish, said length of conduit fully occupied by water flowing therethrough, remotely controlled winch means disposed adjacent the upstream and downstream conduit segments for imparting vertical movement thereto whereby the depth of said segments may be varied to best accommodate the entry and exit of migrating fish, means circumferentially spaced about the interior wall surface of said conduit at spaced apart intervals therealong to impart an eddying flow to the water creating zones of random water currents constituting resting areas for fish migrating through the conduit.
Claim 3
Dependent Claim
52 words
The conduit structure as claimed in claim 1 additionally including a container for receiving a supply of fish attracting substance, said container in communication with the interior of the conduit via a container outlet located within said conduit with the outlet serving to meter the discharge of the substance into the conduit.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |