Patent US6434704B1 successfully refreshed from Google Patents.
US2689710A
Expired / Lapsed
US
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Torque drive for the drill stem of a rotary drilling outfit
Assignee: Page Oil Tools Inc
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Filing: 1949-08-20
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Granted: 1954-09-21
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Expires: 1969-08-20
Abstract
No abstract record available.
Inventors
- 👤 John S Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:27
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/04; F; F16; F16D; F16D2300/00; F16D2300/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1881728A
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GB353416A
Cited
US2080952A
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US2240738A
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US2179006A
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US2174108A
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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) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |