US2538545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Redirecting deflected boreholes
Assignee: Individual
•
Filing: 1946-10-30
•
Granted: 1951-01-16
•
Expires: 1966-10-30
Abstract
No abstract record available.
Inventors
- 👤 Whitehead Randolph Knox
- 👤 Weldon George Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:56
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US140357A
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US292888A
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US1784886A
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US1941723A
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US1902174A
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US2061317A
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US2227233A
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US2251916A
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US2266383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |