Patent US2939681A successfully refreshed from Google Patents.
US2939681A
Expired / Lapsed
US
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Power transmission mechanism for use in a portable drill rig
Assignee: Texas Instruments Inc
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Filing: 1953-03-20
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Granted: 1960-06-07
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Expires: 1973-03-20
Abstract
No abstract record available.
Inventors
- 👤 Alexander B Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:08
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/04; E21B3/06; E21B7/00; E21B7/02; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19019; Y10T74/19023; Y10T74/19037; Y10T74/20; Y10T74/20207; Y10T74/20213
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1874264A
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US2151057A
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US2215928A
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US2589118A
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US2564188A
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US2588408A
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US2594666A
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US2618440A
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US2637220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |