US2646224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact crusher rotor with rigid hammers
Assignee: Jeffrey Manufacturing Co
•
Filing: 1951-05-15
•
Granted: 1953-07-21
•
Expires: 1971-05-15
Abstract
No abstract record available.
Inventors
- 👤 Chrystal John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:01
CPC Classifications
B; B02; B02C; B02C13/00; B02C13/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US589236A
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US198993A
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US711688A
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US1212991A
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US1751009A
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US1446221A
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US1996485A
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CH174148A
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US2278274A
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US2373691A
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US2486421A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |