US2572841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drill
Assignee: Joy Manufacturing Co
•
Filing: 1946-05-31
•
Granted: 1951-10-30
•
Expires: 1966-05-31
Abstract
No abstract record available.
Inventors
- 👤 Charles F Osgood
- 👤 John C Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:38
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1319034A
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US1205140A
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US1253561A
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US1613172A
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US1637192A
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US1691372A
Cited
US1813774A
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US1940846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |