US2519351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knife sharpening machine
Assignee: Individual
•
Filing: 1947-03-22
•
Granted: 1950-08-22
•
Expires: 1967-03-22
Abstract
No abstract record available.
Inventors
- 👤 Glen M Calvert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:10
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/36; B24B3/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US447700A
Cited
US531368A
Cited
US1376634A
Cited
US1444374A
Cited
US1925108A
Cited
US2024860A
Cited
US2142105A
Cited
US2228385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-21 | 1954-02-20 | 1954-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-21 | 1958-02-20 | 1958-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-21 | 1962-02-20 | 1962-08-22 | $7700.00 | Window Closed / Lapsed |