US2540385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core drilling
Assignee: Stanolind Oil and Gas Co
•
Filing: 1945-05-22
•
Granted: 1951-02-06
•
Expires: 1965-05-22
Abstract
No abstract record available.
Inventors
- 👤 Biggs Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:59
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/10; E21B21/00; E21B49/00; E21B49/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE18500E
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US797622A
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US994866A
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GB191126451A
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US1071199A
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US1280159A
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US1484995A
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US1623543A
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US2021184A
Cited
US2217203A
Cited
US2145192A
Cited
US2216962A
Cited
US2329405A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |