US2790683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevatable drill pipe stacking apparatus
Assignee: Individual
•
Filing: 1954-01-08
•
Granted: 1957-04-30
•
Expires: 1974-01-08
Abstract
No abstract record available.
Inventors
- 👤 Walter J Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:36
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/14; E21B19/15; E21B19/155
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US864902A
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US1080581A
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US1275381A
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US1291146A
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US1950593A
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US2201813A
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CH254431A
Cited
US2589181A
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US2543274A
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US2714735A
Cited
US2639450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |