US2941369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling structures
Assignee: Individual
•
Filing: 1955-12-13
•
Granted: 1960-06-21
•
Expires: 1975-12-13
Abstract
No abstract record available.
Inventors
- 👤 Edward J Quirin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:46
CPC Classifications
E; E21; E21B; E21B15/00; E21B15/02; E02; E02B; E02B17/00; E02B17/02; E02B17/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US112525A
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US710170A
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US1335497A
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US2248051A
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US2399656A
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US2430014A
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US2580911A
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US2528089A
Cited
US2652693A
Cited
US2589146A
Cited
US2602300A
Cited
US2658353A
Cited
US2755632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |