Patent US4202806A successfully refreshed from Google Patents.
Patent US2777258A successfully refreshed from Google Patents.
US2777258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sharpening machine
Assignee: DARELL E AVRA
•
Filing: 1953-09-01
•
Granted: 1957-01-15
•
Expires: 1973-09-01
Abstract
No abstract record available.
Inventors
- 👤 Lela M Avra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:26
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/36; B24B3/42
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US556868A
Cited
US1967118A
Cited
US2149774A
Cited
US2187289A
Cited
US2286970A
Cited
US2279798A
Cited
US2377126A
Cited
US2466905A
Cited
US2493619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |