Patent US43658A successfully refreshed from Google Patents.
US43658A
Expired / Lapsed
US
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Improved mode of hardening and repairing files and rasps
Assignee: —
•
Filing: —
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Granted: 1864-07-26
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Expires: 1881-07-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:26
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/06
Claims Analysis
Total Claims: 0
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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) | 1867-07-26 | 1868-01-25 | 1868-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1871-07-26 | 1872-01-25 | 1872-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1875-07-26 | 1876-01-25 | 1876-07-26 | $7700.00 | Window Closed / Lapsed |