Patent US2858108A successfully refreshed from Google Patents.
US2858108A
Expired / Lapsed
US
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Well drilling system
Assignee: DRILLING RES Inc
•
Filing: 1953-04-22
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Granted: 1958-10-28
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Expires: 1973-04-22
Abstract
No abstract record available.
Inventors
- 👤 Boyd A Wise
- 👤 Donald E Cooper
- 👤 Robert L Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:35
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1600492A
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US1891062A
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US2076330A
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US1966446A
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US2249835A
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US2328496A
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US2566984A
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US2632858A
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US2554005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |