US2489566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core orienting apparatus
Assignee: Eastman Oil Well Survey Co
•
Filing: 1945-11-27
•
Granted: 1949-11-29
•
Expires: 1965-11-27
Abstract
No abstract record available.
Inventors
- 👤 Charles T Engle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:02
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2186677A
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US2260320A
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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) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |