US2491273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling apparatus
Assignee: Joy Manufacturing Co
•
Filing: 1945-03-24
•
Granted: 1949-12-13
•
Expires: 1965-03-24
Abstract
No abstract record available.
Inventors
- 👤 Ray A Lehner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:48
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/086
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US511467A
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US557686A
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CH10811A
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GB189819292A
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US1667156A
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US1978368A
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US1878074A
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US2218491A
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US2090330A
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US2320874A
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US2331179A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |