US2679910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable derrick
Assignee: United States Steel Corp
•
Filing: 1948-11-02
•
Granted: 1954-06-01
•
Expires: 1968-11-02
Abstract
No abstract record available.
Inventors
- 👤 Dewey R Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:14
CPC Classifications
E; E21; E21B; E21B15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1435654A
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US2113270A
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US2268796A
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US2240852A
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US2334916A
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US2365900A
Cited
US2344390A
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US2403080A
Cited
US2413149A
Cited
US2589181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |