US2829741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescoping self-erecting derrick structure
Assignee: IDECO Inc
•
Filing: 1951-04-25
•
Granted: 1958-04-08
•
Expires: 1971-04-25
Abstract
No abstract record available.
Inventors
- 👤 John P Selberg
- 👤 Arnold A Kahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:59
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AT34278B
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US1862621A
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US2129466A
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US2331558A
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US2364851A
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US2576389A
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US2617500A
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US2689549A
Cited
US2589080A
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US2685353A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |