Patent US3376942A successfully refreshed from Google Patents.
US3376942A
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US
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Large hole vertical drilling apparatus
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1965-07-13
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Granted: 1968-04-09
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Expires: 1985-07-13
Abstract
No abstract record available.
Inventors
- 👤 Denzal W Van Winkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:21
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/18; E21B10/00; E21B10/26; E21B10/28; E21B21/00; E21B21/08; E21B23/00; E21B33/00; E21B33/10; E21B33/12; E21B33/128; E21B4/04; E21D; E21D1/00; E21D1/03; E21D1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2663545A
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US2891769A
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US2964578A
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US3141512A
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US3185225A
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US3298449A
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US3283835A
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US3195835A
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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) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |