US2553874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional drilling apparatus
Assignee: Eastman Oil Well Survey Co
•
Filing: 1948-03-05
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Granted: 1951-05-22
•
Expires: 1968-03-05
Abstract
No abstract record available.
Inventors
- 👤 Charles W Spaulding
- 👤 Collins Charles Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:53
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06; E21B7/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |