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US2617631A
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Rock drilling tool
Assignee: Ingersoll Rand Co
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Filing: 1948-10-28
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Granted: 1952-11-11
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Expires: 1968-10-28
Abstract
No abstract record available.
Inventors
- 👤 Benjamin F Shepherd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:14
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1899458A
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US2255301A
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US2502128A
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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) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |