US2421066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flood control system
Assignee: Individual
•
Filing: 1944-09-29
•
Granted: 1947-05-27
•
Expires: 1964-09-29
Abstract
No abstract record available.
Inventors
- 👤 Elra F Howe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:57
CPC Classifications
E; E03; E03F; E03F5/00; E03F5/22; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2577; Y10T137/6851; Y10T137/6966; Y10T137/6969; Y10T137/6988; Y10T137/7287; Y10T137/7358; Y10T137/7368
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US757169A
Cited
US1348016A
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US1613007A
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US1607248A
Cited
US1929523A
Cited
US1991081A
Cited
US2059635A
Cited
US2116422A
Cited
US2347544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-26 | 1950-11-25 | 1951-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-26 | 1954-11-25 | 1955-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-26 | 1958-11-25 | 1959-05-27 | $7700.00 | Window Closed / Lapsed |