US3208225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sinking float-operated irrigation gate
Assignee: Individual
•
Filing: 1962-05-04
•
Granted: 1965-09-28
•
Expires: 1982-05-04
Abstract
No abstract record available.
Inventors
- 👤 Allan S Humpherys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:19
CPC Classifications
E; E02; E02B; E02B13/00; E02B13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US291327A
Cited
US487961A
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US614675A
Cited
US670888A
Cited
AT43122B
Cited
US1166991A
Cited
US1579288A
Cited
US2168117A
Cited
US2984986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |