US2696367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for stabilizing well drills
Assignee: A 1 Bit & Tool Co
•
Filing: 1949-05-13
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Granted: 1954-12-07
•
Expires: 1969-05-13
Abstract
No abstract record available.
Inventors
- 👤 Earl J Robishaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:45
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/16; E21B17/02; E21B17/04; E21B17/07; E21B17/10; E21B17/1057; E21B17/1064
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2589534A
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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) | 1957-12-06 | 1958-06-07 | 1958-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-06 | 1962-06-07 | 1962-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-06 | 1966-06-07 | 1966-12-07 | $7700.00 | Window Closed / Lapsed |