US2567451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling apparatus
Assignee: Individual
•
Filing: 1948-09-14
•
Granted: 1951-09-11
•
Expires: 1968-09-14
Abstract
No abstract record available.
Inventors
- 👤 William H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:17
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US196220A
Cited
GB190402443A
Cited
US1350059A
Cited
US1406348A
Cited
US1380203A
Cited
US1555918A
Cited
US1501481A
Cited
US1777961A
Cited
US1799559A
Cited
US1736254A
Cited
US1717271A
Cited
US1880217A
Cited
DE626830C
Cited
US2105091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |