Patent US2641444A successfully refreshed from Google Patents.
US2641444A
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US
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Method and apparatus for drilling boreholes
Assignee: Signal Oil and Gas Co
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Filing: 1946-09-03
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Granted: 1953-06-09
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Expires: 1966-09-03
Abstract
No abstract record available.
Inventors
- 👤 Moon James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:05
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/20; E21B19/00; E21B19/08; E21B19/084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US804092A
Cited
US1147898A
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US1166011A
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US1391626A
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US1894039A
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US2112254A
Cited
US2100419A
Cited
US2292126A
Cited
US2242279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |