Patent US2640735A successfully refreshed from Google Patents.
US2640735A
Expired / Lapsed
US
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Stabilizer for drill collars and drill pipe
Assignee: Hughes Tool Co
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Filing: 1947-02-17
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Granted: 1953-06-02
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Expires: 1967-02-17
Abstract
No abstract record available.
Inventors
- 👤 Fred A Seott
- 👤 Floyd L Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:00
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1078
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1254909A
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US1797223A
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GB332914A
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US1985229A
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US1844371A
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US1894519A
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US2072320A
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US2168707A
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US2145336A
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US2166937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |