US111620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in devices for enlarging wells
Assignee: —
•
Filing: —
•
Granted: 1871-02-07
•
Expires: 1888-02-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:51
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/32; E21B10/325
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1874-02-06 | 1874-08-08 | 1875-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1878-02-06 | 1878-08-08 | 1879-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1882-02-06 | 1882-08-08 | 1883-02-07 | $7700.00 | Window Closed / Lapsed |