US2511991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drilling tool
Assignee: Individual
•
Filing: 1948-02-25
•
Granted: 1950-06-20
•
Expires: 1968-02-25
Abstract
No abstract record available.
Inventors
- 👤 Nussbaum Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:18
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1572349A
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US1676887A
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US1610569A
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US1887372A
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FR687791A
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US1902513A
Cited
US2164598A
Cited
GB453344A
Cited
US2081302A
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US2280851A
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US2187384A
Cited
US2371488A
Cited
US2371698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-19 | 1953-12-19 | 1954-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-19 | 1957-12-19 | 1958-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-19 | 1961-12-19 | 1962-06-20 | $7700.00 | Window Closed / Lapsed |