US170868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in drop-hammers
Assignee: —
•
Filing: —
•
Granted: 1875-12-07
•
Expires: 1892-12-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:41
CPC Classifications
B; B21; B21D; B21D1/00; B21D1/06; B21J; B21J7/00; B21J7/02; B21J7/10; B21J7/12; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20582; Y10T74/20588; Y10T74/20594
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) | 1878-12-06 | 1879-06-07 | 1879-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1882-12-06 | 1883-06-07 | 1883-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1886-12-06 | 1887-06-07 | 1887-12-07 | $7700.00 | Window Closed / Lapsed |