US2079841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary rig drilling control
Assignee: Individual
•
Filing: 1935-12-07
•
Granted: 1937-05-11
•
Expires: 1955-12-07
Abstract
No abstract record available.
Inventors
- 👤 Amon H Carson
- 👤 Rexford O Anderson
- 👤 Clarence D Davenport
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:37
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-05-10 | 1940-11-09 | 1941-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-05-10 | 1944-11-09 | 1945-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-05-10 | 1948-11-09 | 1949-05-11 | $7700.00 | Window Closed / Lapsed |