US3596468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fish ladders
Assignee: Individual
•
Filing: 1969-06-02
•
Granted: 1971-08-03
•
Expires: 1989-06-02
Abstract
Abstract A fish ladder having located within one body of water a chamber which is selectively opened and closed to isolate fish therein, and passage means for delivering into the chamber from a second body of water at a higher elevation a predetermined minimum flow of water when the chamber is opened to thereby attract fish therein, and a predetermined maximum flow of water when the chamber is closed whereby fish isolated within the chamber are subjected to increased pressure and instinctively swim through passage means and into the second body of water.
Inventors
- 👤 Herbert K Fairbanks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:04
CPC Classifications
E; E02; E02B; E02B8/00; E02B8/08; E02B8/085; Y; Y02; Y02A; Y02A40/00; Y02A40/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
127 words
A fish ladder including an intake structure located within a first body of water and having a forebay and a chamber, an opening between said forebay and chamber, means for selectively covering and uncovering said opening, passage means provided for a flow of water through said chamber and into said forebay from a second body of water having a surface at a higher elevation than such first body thereof, and a value in said passage means operative in alternate relationship with the means for covering and uncovering said opening for permitting maximum flow of water through said passage means and into said chamber only when said opening is covered, said passage means including a pipe for discharging into said forebay an overflow of water from said chamber.
Claim 2
Dependent Claim
127 words
A fish ladder including an intake structure located within a first body of water and having a forebay and a chamber, an opening between said forebay and chamber, means for selectively covering and uncovering said opening, passage means provided for a flow of water through said chamber and into said forebay from a second body of water having a surface at a higher elevation than such first body thereof, and a value in said passage means operative in alternate relationship with the means for covering and uncovering said opening for permitting maximum flow of water through said passage means and into said chamber only when said opening is covered, said passage means including a pipe for discharging into said forebay an overflow of water from said chamber.
Claim 3
Dependent Claim
39 words
A fish ladder as defined in claim 1 wherein said passage means includes means operative independeNtly of said valve for delivering a continuous, controlled and less than maximum flow of water through said passage means and to said chamber.
Claim 4
Dependent Claim
99 words
A fish ladder as defined in claim 2 wherein the passage means includes a conduit which opens at one end into said chamber and at its opposite end thereof into the second body of water, said valve being positioned within said chamber for stopping the flow of water into said chamber through said conduit when said opening is uncovered and permitting such maximum flow when said opening is covered and wherein said means for delivering a continuous, controlled flow of water continuously into said chamber includes a pipe extending between said conduit and said chamber and bypassing said valve.
Claim 5
Dependent Claim
25 words
A fish ladder as defined in claim 3 further including a valve in said bypass for controlling the velocity of the flow of water therethrough.
Claim 6
Dependent Claim
26 words
A fish ladder as defined in claim 4 further including a valve in said overflow pipe for controlling the velocity of the flow of water therethrough.
References Cited (Backward Citations)
US2910833A
Cited
US3293862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |