Patent US2578531A successfully refreshed from Google Patents.
US2578531A
Expired / Lapsed
US
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Machine for grinding impeller bucket shanks
Assignee: Jones and Lamson Machine Co
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Filing: 1948-08-14
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Granted: 1951-12-11
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Expires: 1968-08-14
Abstract
No abstract record available.
Inventors
- 👤 Ernest V Flanders
- 👤 Carroll H Drury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:36
CPC Classifications
B; B24; B24B; B24B19/00; B24B19/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US562268A
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US1139569A
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US1865067A
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US1837342A
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US1987222A
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US2206492A
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US2087662A
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US2319154A
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US2368992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-10 | 1955-06-11 | 1955-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-10 | 1959-06-11 | 1959-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-10 | 1963-06-11 | 1963-12-11 | $7700.00 | Window Closed / Lapsed |