US462392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling apparatus
Assignee: —
•
Filing: —
•
Granted: 1891-11-03
•
Expires: 1908-11-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:18
CPC Classifications
E; E21; E21B; E21B25/00
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) | 1894-11-02 | 1895-05-04 | 1895-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1898-11-02 | 1899-05-04 | 1899-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1902-11-03 | 1903-05-05 | 1903-11-04 | $7700.00 | Window Closed / Lapsed |