Patent US2420447A successfully refreshed from Google Patents.
US2420447A
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US
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Orienting apparatus
Assignee: Eastman Oil Well Survey Co
•
Filing: 1944-08-28
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Granted: 1947-05-13
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Expires: 1964-08-28
Abstract
No abstract record available.
Inventors
- 👤 Charles H Schadel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:12
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/024; E21B47/022; E21B47/0236
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1895615A
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US1981665A
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US1918448A
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US1903512A
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US2109853A
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US2100418A
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US2173745A
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US2246417A
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US2282431A
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US2301307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |