US2614807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drilling apparatus
Assignee: Joy Manufacturing Co
•
Filing: 1947-10-21
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Granted: 1952-10-21
•
Expires: 1967-10-21
Abstract
No abstract record available.
Inventors
- 👤 John C Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:19
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/025; E21D; E21D9/00; E21D9/12; E21D9/122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2468378A
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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) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |