US2721059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for drilling and completing wells
Assignee: Individual
•
Filing: 1950-11-24
•
Granted: 1955-10-18
•
Expires: 1970-11-24
Abstract
No abstract record available.
Inventors
- 👤 Roy F Wilcox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:20
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/36; E21B27/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1117424A
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US1213652A
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US1455010A
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US1401488A
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US1570828A
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US1839844A
Cited
US2208975A
Cited
US2329461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |