Patent US2683584A successfully refreshed from Google Patents.
US2683584A
Expired / Lapsed
US
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Overlay hoisting winch for portable well derricks
Assignee: DRESSER EQUIPMENT Co
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Filing: 1951-04-09
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Granted: 1954-07-13
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Expires: 1971-04-09
Abstract
No abstract record available.
Inventors
- 👤 John P Selberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:32
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US983795A
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US1644613A
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US1913508A
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US2063912A
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US2275195A
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US2329943A
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US2423906A
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US2551149A
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US2593246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-12 | 1958-01-11 | 1958-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-12 | 1962-01-11 | 1962-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-12 | 1966-01-11 | 1966-07-13 | $7700.00 | Window Closed / Lapsed |