Patent US2691252A successfully refreshed from Google Patents.
US2691252A
Expired / Lapsed
US
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Knife sharpener
Assignee: Individual
•
Filing: 1951-05-28
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Granted: 1954-10-12
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Expires: 1971-05-28
Abstract
No abstract record available.
Inventors
- 👤 George C Punton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:20
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/36; B24B3/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US386544A
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US1007951A
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US1134587A
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GB155914A
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US1426911A
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US1933640A
Cited
US2124646A
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GB474100A
Cited
US2181923A
Cited
US2294715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |