Patent US4521647A successfully refreshed from Google Patents.
Patent US2741667A successfully refreshed from Google Patents.
Patent US543903A successfully refreshed from Google Patents.
Patent US3057768A successfully refreshed from Google Patents.
Patent US2180952A successfully refreshed from Google Patents.
US2180952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for sharpening knifeedges
Assignee: SEEDERER KOHLBUSCH Inc
•
Filing: 1938-02-10
•
Granted: 1939-11-21
•
Expires: 1958-02-10
Abstract
No abstract record available.
Inventors
- 👤 Gattoni John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:30
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/36; Y; Y10; Y10S; Y10S29/00; Y10S29/055; Y10S29/094; Y10S29/095; Y10S29/101; Y10T; Y10T409/00; Y10T409/30; Y10T409/304536; Y10T409/305488
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-11-20 | 1943-05-22 | 1943-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-11-20 | 1947-05-22 | 1947-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-11-20 | 1951-05-22 | 1951-11-21 | $7700.00 | Window Closed / Lapsed |