Patent US2877984A successfully refreshed from Google Patents.
US2877984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for well drilling
Assignee: Individual
•
Filing: 1954-07-26
•
Granted: 1959-03-17
•
Expires: 1974-07-26
Abstract
No abstract record available.
Inventors
- 👤 Otis A Causey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:34
CPC Classifications
E; E21; E21B; E21B1/00; E21B1/12; E21B1/24; E21B1/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1461713A
Cited
US2345024A
Cited
US2544979A
Cited
US2485098A
Cited
US2626778A
Cited
US2559012A
Cited
US2675082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |