Patent US3041901A successfully refreshed from Google Patents.
US3041901A
Expired / Lapsed
US
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Make-up and break-out mechanism for drill pipe joints
Assignee: Dowty Rotol Ltd
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Filing: 1960-05-16
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Granted: 1962-07-03
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Expires: 1980-05-16
Abstract
No abstract record available.
Inventors
- 👤 Richard N Knights
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:30
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/16; E21B19/161; E21B19/163
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2544639A
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US2566561A
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US2639894A
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US2737839A
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US2760392A
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US2850929A
Cited
US2871743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |