Patent US2943239A successfully refreshed from Google Patents.
US2943239A
Expired / Lapsed
US
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Method and apparatus for renewing targets
Assignee: Schlumberger Well Surveying Corp
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Filing: 1954-06-29
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Granted: 1960-06-28
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Expires: 1974-06-29
Abstract
No abstract record available.
Inventors
- 👤 Goodman Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:28
CPC Classifications
H; H01; H01J; H01J27/00; H01J27/02; H01J27/04; H05; H05H; H05H3/00; H05H3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US820365A
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US1653366A
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US2126395A
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US2069495A
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US2497911A
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US2449838A
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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) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |