Patent US2695771A successfully refreshed from Google Patents.
US2695771A
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US
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Tool for removing material from well bore walls
Assignee: Grant Oil Tool Co
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Filing: 1951-05-04
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Granted: 1954-11-30
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Expires: 1971-05-04
Abstract
No abstract record available.
Inventors
- 👤 Salvatori Henry
- 👤 Stewart Herman Van Dien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:00
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/28; E21B10/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1723380A
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GB446307A
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US2033638A
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US2138007A
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US2189035A
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US2189037A
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US2189040A
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US2272405A
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US2234219A
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US2260366A
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US2306492A
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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) | 1957-11-29 | 1958-05-31 | 1958-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-29 | 1962-05-31 | 1962-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-29 | 1966-05-31 | 1966-11-30 | $7700.00 | Window Closed / Lapsed |