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US177378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in well-borers
Assignee: —
•
Filing: —
•
Granted: 1876-05-16
•
Expires: 1893-05-16
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:06
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/07; E21B17/073
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) | 1879-05-16 | 1879-11-15 | 1880-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1883-05-16 | 1883-11-15 | 1884-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1887-05-16 | 1887-11-15 | 1888-05-16 | $7700.00 | Window Closed / Lapsed |