Patent US2767520A successfully refreshed from Google Patents.
US2767520A
Expired / Lapsed
US
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Form grinding machine
Assignee: GEAR GRINDING MACH CO
•
Filing: 1953-05-18
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Granted: 1956-10-23
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Expires: 1973-05-18
Abstract
No abstract record available.
Inventors
- 👤 Ireneusz M Rudnicki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:01
CPC Classifications
B; B23; B23F; B23F1/00; B23F1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US999610A
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US1228798A
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US1302540A
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US2047869A
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US2030907A
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US2048462A
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US2247412A
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US2312161A
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US2375323A
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US2412284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |