Patent US2416441A successfully refreshed from Google Patents.
US2416441A
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US
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Determination of well pipe perforations
Assignee: Grant Oil Tool Co
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Filing: 1944-11-03
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Granted: 1947-02-25
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Expires: 1964-11-03
Abstract
No abstract record available.
Inventors
- 👤 Grant John
- 👤 James J Santiago
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:09
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/127; E21B47/00; E21B47/09; E21B47/098
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1861999A
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US2000527A
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US2153917A
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US2184689A
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US2201096A
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US2281960A
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US2348192A
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US2277898A
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US2270505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-02-24 | 1950-08-26 | 1951-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-24 | 1954-08-26 | 1955-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-24 | 1958-08-26 | 1959-02-25 | $7700.00 | Window Closed / Lapsed |