US2919899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling rig
Assignee: Individual
•
Filing: 1956-10-29
•
Granted: 1960-01-05
•
Expires: 1976-10-29
Abstract
No abstract record available.
Inventors
- 👤 Leo L Hitchcock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:36
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/024; E21B15/00; E21B15/04; E21B7/027
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US256658A
Cited
US816295A
Cited
US1496153A
Cited
US2594098A
Cited
US2562276A
Cited
US2639892A
Cited
US2474981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |