US2813697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilizer for drill collars and drill pipes
Assignee: SECURITY ENGINEERING DIVISION
•
Filing: 1953-06-15
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Granted: 1957-11-19
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Expires: 1973-06-15
Abstract
No abstract record available.
Inventors
- 👤 Kenneth H Swart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:29
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1042; E21B17/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2126405A
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US2197531A
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US2572307A
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US2640735A
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US2636787A
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US2657101A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |