US373440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for sinking wells
Assignee: —
•
Filing: —
•
Granted: 1887-11-22
•
Expires: 1904-11-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:51
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/12; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/7913
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) | 1890-11-21 | 1891-05-23 | 1891-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1894-11-21 | 1895-05-23 | 1895-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1898-11-21 | 1899-05-23 | 1899-11-22 | $7700.00 | Window Closed / Lapsed |