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US2807441A
Expired / Lapsed
US
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Portable drilling rig assembly
Assignee: Individual
•
Filing: 1954-03-08
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Granted: 1957-09-24
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Expires: 1974-03-08
Abstract
No abstract record available.
Inventors
- 👤 Ben W Sewell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:11
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/022; E21B7/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1412069A
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US1846177A
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US2200075A
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US2210296A
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US2594098A
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US2440060A
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US2516182A
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US2610031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |