US2842339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic well drilling apparatus
Assignee: MUD CONTROL LAB Inc
•
Filing: 1956-05-14
•
Granted: 1958-07-08
•
Expires: 1976-05-14
Abstract
No abstract record available.
Inventors
- 👤 Gresham William Calvin
- 👤 Robert H Ashby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:25
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1926119A
Cited
US1919611A
Cited
US2126189A
Cited
US2274339A
Cited
US2609181A
Cited
US2688871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |