Patent US3324854A successfully refreshed from Google Patents.
US2664178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling rig base
Assignee: ROCKY MOUNTAIN DRILLING Co
•
Filing: 1949-05-13
•
Granted: 1953-12-29
•
Expires: 1969-05-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Louis A Whipple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:07
CPC Classifications
E; E21; E21B; E21B15/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1118979A
Cited
US1540140A
Cited
US1930856A
Cited
US2125396A
Cited
US2134008A
Cited
US2308242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |