Patent US2640303A successfully refreshed from Google Patents.
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 19:08
CPC Classifications
B; B24; B24B; B24B21/00; B24B21/002; B24B3/00; B24B3/36; B24B3/54
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US557462A
Cited
US598671A
Cited
US961554A
Cited
US1018562A
Cited
US1286560A
Cited
US1628531A
Cited
US2161992A
Cited
US2222361A
Cited
US2322459A
Cited
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 |