US2646253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional drilling
Assignee: Signal Oil and Gas Co
•
Filing: 1950-01-03
•
Granted: 1953-07-21
•
Expires: 1970-01-03
Abstract
No abstract record available.
Inventors
- 👤 Daniel S Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:45
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1078; E21B7/00; E21B7/04; E21B7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1490759A
Cited
DE448693C
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US2084421A
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US2072320A
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US2079449A
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US2076039A
Cited
US2280851A
Cited
US2212067A
Cited
US2485763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |