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Patent US2169249A successfully refreshed from Google Patents.
US2169249A
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Method of and means for effecting downstream migration of fish about dams
Assignee: Individual
•
Filing: 1938-03-01
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Granted: 1939-08-15
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Expires: 1958-03-01
Abstract
No abstract record available.
Inventors
- 👤 Harlan B Holmes
- 👤 Henry F Blood
- 👤 Milo C Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:53
CPC Classifications
E; E02; E02B; E02B8/00; E02B8/08; E02B8/085; Y; Y02; Y02A; Y02A40/00; Y02A40/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-08-14 | 1943-02-13 | 1943-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-08-14 | 1947-02-13 | 1947-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-08-14 | 1951-02-13 | 1951-08-15 | $7700.00 | Window Closed / Lapsed |