US2628818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling rig
Assignee: Phillips Petroleum Co
•
Filing: 1949-05-16
•
Granted: 1953-02-17
•
Expires: 1969-05-16
Abstract
No abstract record available.
Inventors
- 👤 Tom S Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:40
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/14; E21B19/143; E02; E02B; E02B17/00; E02B17/02; E02B17/027; E21B15/00; E21B15/003
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1097225A
Cited
US1769858A
Cited
US1904249A
Cited
US1998803A
Cited
US2077044A
Cited
US2248051A
Cited
US2399656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |