Patent US2680940A successfully refreshed from Google Patents.
US2680940A
Expired / Lapsed
US
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Machine for sharpening endless metal band blades
Assignee: Bettendorf Co
•
Filing: 1952-02-27
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Granted: 1954-06-15
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Expires: 1972-02-27
Abstract
No abstract record available.
Inventors
- 👤 Hill Gordon
- 👤 Louis L Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:28
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/58; B24B3/583
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1921039A
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US811454A
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US966732A
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US1049412A
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US1090577A
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US1255799A
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US1607292A
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US2002812A
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US2034621A
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US2183995A
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US2541080A
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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) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |