US2640303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knife sharpening and grinding attachment
Assignee: Individual
•
Filing: 1951-07-02
•
Granted: 1953-06-02
•
Expires: 1971-07-02
Abstract
No abstract record available.
Inventors
- 👤 Arnold R Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:43
CPC Classifications
B; B24; B24B; B24B21/00; B24B21/002; B24B3/00; B24B3/36; B24B3/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US557462A
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US598671A
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US961554A
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US1018562A
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US1286560A
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US1628531A
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US2161992A
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US2222361A
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US2322459A
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US2334960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |