US2821433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hopper dumping closure
Assignee: COOK BROS EQUIPMENT Co
•
Filing: 1955-07-08
•
Granted: 1958-01-28
•
Expires: 1975-07-08
Abstract
No abstract record available.
Inventors
- 👤 Buck C Hamlet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:39
CPC Classifications
B; B60; B60P; B60P1/00; B60P1/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US855128A
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US1368886A
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CH93135A
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US2080845A
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US2316412A
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US2539731A
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US2663467A
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US2616758A
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US2721761A
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US2729503A
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US2700574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |