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Patent US3412491A successfully refreshed from Google Patents.
US3412491A
Expired / Lapsed
US
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Lock for reversible bucket wheel
Assignee: Hewitt Robins Inc
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Filing: 1966-02-17
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Granted: 1968-11-26
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Expires: 1986-02-17
Abstract
No abstract record available.
Inventors
- 👤 Johann A Raabe
- 👤 Westerbrink Wiebrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:22
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/18; E02F3/22; E02F3/24; E02F3/243
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1974190A
Cited
US2300843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |