Patent US55524A successfully refreshed from Google Patents.
US55524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in nicking screw-heads
Assignee: —
•
Filing: —
•
Granted: 1866-06-12
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Expires: 1883-06-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:12
CPC Classifications
F; F16; F16B; F16B23/00; F16B23/0061; Y; Y10; Y10S; Y10S411/00; Y10S411/919
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) | 1869-06-11 | 1869-12-11 | 1870-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1873-06-11 | 1873-12-11 | 1874-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1877-06-11 | 1877-12-11 | 1878-06-12 | $7700.00 | Window Closed / Lapsed |