Patent US2817495A successfully refreshed from Google Patents.
US2817495A
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US
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Dual vehicle supported drilling rig
Assignee: Henderson Welding Works Inc
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Filing: 1953-09-28
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Granted: 1957-12-24
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Expires: 1973-09-28
Abstract
No abstract record available.
Inventors
- 👤 Pearl Eugene John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:29
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA489237A
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US2113270A
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US2215928A
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US2176731A
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US2429010A
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US2613059A
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US2576872A
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US2615679A
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US2573528A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |