US2798345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knife sharpener
Assignee: Nutone Inc
•
Filing: 1954-12-02
•
Granted: 1957-07-09
•
Expires: 1974-12-02
Abstract
No abstract record available.
Inventors
- 👤 Walter A Spear
- 👤 Lindol H Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:14
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/36; B24B3/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US440948A
Cited
US594320A
Cited
US1664896A
Cited
US1983011A
Cited
US2129538A
Cited
US2146548A
Cited
US2504194A
Cited
US2616231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |