US2569291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for grinding and polishing blocks of stone
Assignee: LINCOLN IRON WORKS
•
Filing: 1949-12-14
•
Granted: 1951-09-25
•
Expires: 1969-12-14
Abstract
No abstract record available.
Inventors
- 👤 Richard H Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:52
CPC Classifications
B; B24; B24B; B24B7/00; B24B7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US390926A
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GB190103220A
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US931383A
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US1044423A
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US1501327A
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US1725899A
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US2073400A
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US2089808A
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US2285808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |