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Patent US2493619A successfully refreshed from Google Patents.
US2493619A
Expired / Lapsed
US
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Machine for sharpening the knives of lawn mowers
Assignee: Individual
•
Filing: 1946-05-06
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Granted: 1950-01-03
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Expires: 1966-05-06
Abstract
No abstract record available.
Inventors
- 👤 Eugene F Comstock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:21
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/36; B24B3/42
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |