US2993570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable trailer-mounted derrick
Assignee: Individual
•
Filing: 1955-04-18
•
Granted: 1961-07-25
•
Expires: 1975-04-18
Abstract
No abstract record available.
Inventors
- 👤 Emil A Bender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:46
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E04; E04H; E04H12/00; E04H12/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US524476A
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US701975A
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US1743123A
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US2267705A
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US2354922A
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US2583958A
Cited
US2565777A
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US2617500A
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US2725959A
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US2829741A
Cited
US2656023A
Cited
US2781108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |