US2696972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable earth drill
Assignee: Atlantic Richfield Co
•
Filing: 1951-01-26
•
Granted: 1954-12-14
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Expires: 1971-01-26
Abstract
No abstract record available.
Inventors
- 👤 Spencer D Howe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:58
CPC Classifications
E; E21; E21B; E21B11/00; E21B11/005; E21B3/00; E21B3/02; E21B7/00; E21B7/02; E21B7/027; E21B7/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US614333A
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US1200612A
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US1343902A
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US1507294A
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US1876126A
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US2016667A
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US2201733A
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US2214370A
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US2287450A
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US2403041A
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US2598565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-13 | 1958-06-14 | 1958-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-13 | 1962-06-14 | 1962-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-13 | 1966-06-14 | 1966-12-14 | $7700.00 | Window Closed / Lapsed |