Patent US2415221A successfully refreshed from Google Patents.
US2415221A
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Well surveying instrument
Assignee: Halliburton Oil Well Cementing Co
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Filing: 1943-05-21
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Granted: 1947-02-04
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Expires: 1963-05-21
Abstract
No abstract record available.
Inventors
- 👤 Christian W Savitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:53
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/022; E21B47/0236
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE19039E
Cited
US1404580A
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US1209102A
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US1610625A
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US1887773A
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US1901567A
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US1919332A
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US1928971A
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US2202452A
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US2190950A
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US2317632A
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US2338028A
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US2309905A
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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) | 1950-02-03 | 1950-08-05 | 1951-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-03 | 1954-08-05 | 1955-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-03 | 1958-08-05 | 1959-02-04 | $7700.00 | Window Closed / Lapsed |