US2688848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable drilling equipment
Assignee: Signal Oil and Gas Co
•
Filing: 1949-09-26
•
Granted: 1954-09-14
•
Expires: 1969-09-26
Abstract
No abstract record available.
Inventors
- 👤 Moon James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 22:45
CPC Classifications
E; E02; E02B; E02B17/00; E02B17/02; E02B17/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1867030A
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US2178667A
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US2210408A
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US2352370A
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US2327118A
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US2398351A
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US2422168A
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US2429952A
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US2574140A
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US2482788A
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US2598329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |