Patent US2544993A successfully refreshed from Google Patents.
US2544993A
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Drill bit
Assignee: Eastman Oil Well Survey Co
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Filing: 1947-05-19
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Granted: 1951-03-13
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Expires: 1967-05-19
Abstract
No abstract record available.
Inventors
- 👤 Jackson John Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:52
CPC Classifications
E; E21; E21B; E21B25/00; E21B10/00; E21B10/42
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) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |